C/C++ Programming Help Thread

[SG57]

#include <pspdisplay.h>
#include <pspgu.h>
#include <pspkernel.h>
#include <pspctrl.h>
#include <pspdebug.h>
#include <stdlib.h>
#include <stdio.h>
#include "graphics.h"
#define printf pspDebugScreenPrintf
#define dprint pspDebugScreenPrintf
#define true 1
#define false !true
#define bool int

PSP_MODULE_INFO("???", 0, 1, 1);

int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}

int i;
bool rn0 = 0;
    
int rand() {
     sceCtrlPeekBufferPositive(&pad, 1);
     
     if (pad.Buttons != 0){
          if(pad.Buttons & PSP_CTRL_CROSS) {
           rn0=rand()%10000; //generates random number
          }
     }
     if (rn0==0) {
        pspDebugScreenSetXY(0,2);
        pspDebugScreenPrintf("Press 'X' to start"); //prints text to the screen
     } else {
          pspDebugScreenSetXY(0, 2); //setting up our X and Y coordinates
          pspDebugScreenClear(); //clears screen
          pspDebugScreenSetBackColor(0x00FF0000);
          
          for(i=0;i<65;i++) {
                            for(z=0;z<36;z++) {
                                              printf(" ");
                            }
          }
          
          pspDebugScreenSetTextColor(0x00000000); //sets text color with HEX
          pspDebugScreenPrintf("Generated Integer:%d",rn0); //prints text to the screen
     }
}
int main(void) { //main functions
          pspDebugScreenInit();
          SetupCallbacks();
          SceCtrlData pad;
          
          while (1) {
                    //while loop
                    rand();
          }
return 0;
}

Try that...

[Waterbottle]

what are you trying to do with the
int rand() {
line in the middle of your main function?
you should probally delete that.

on a side note. sceCtrlPeekBufferPositive (&pad, 1);
should be inside your while loop.
and the if (pad.Buttons != 0){ check is completly unecesarry.

[psphacker12.]

#include <pspdisplay.h>
#include <pspgu.h>
#include <pspkernel.h>
#include <pspctrl.h>
#include <pspdebug.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
#include "graphics.h"
#define printf pspDebugScreenPrintf
#define dprint pspDebugScreenPrintf
#define true 1
#define false !true
#define bool int

PSP_MODULE_INFO("???", 0, 1, 1);

//Standard callbacks
int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}

int i;
bool rn0 = 0;

int rand() {
     sceCtrlPeekBufferPositive(&pad, 1);
     srand(sceKernelLibcTime(NULL));
     if (pad.Buttons != 0){
          if(pad.Buttons & PSP_CTRL_CROSS) {
           rn0=rand()%10000; //generates random number
          }
     }
     if (rn0 != 0) {
        pspDebugScreenSetXY(0,2);
        pspDebugScreenPrintf("Press 'X' to start"); //prints text to the screen
     } else {
          pspDebugScreenSetXY(0, 2); //sets up our X and Y coordinates
          pspDebugScreenClear(); //clears screen
          pspDebugScreenSetBackColor(0x00FF0000); //sets screen color with HEX
          pspDebugScreenSetTextColor(0x00000000); //sets text color with HEX
          pspDebugScreenPrintf("Generated Integer:%d",rn0); //prints text to the screen
     }
}
int main(void) { 
          //main functions
          pspDebugScreenInit();
          SetupCallbacks();
          SceCtrlData pad;
          while (1) {
                    //while loop
                    rand();
          }
return 0;
}

hm now i get this error

[email protected] ~
$ cd /pspdev

[email protected] /pspdev
$ make
psp-gcc -I. -I/usr/psp/sdk/include -O2 -G0 -Wall   -c -o main.o main.c
main.c : In function 'rand':
main.c(48) : error: 'pad' undeclared (first use in this function)
main.c(48) : error: (Each undeclared identifier is reported only once
main.c(48) : error: for each function it appears in.)
main.c : In function 'main':
main.c(76) : warning: unused variable 'pad'
make: *** [main.o] Error 1

[email protected] /pspdev
$

It keeps sayind 'pad' is undeclared. hmm weird.

[hallo007]

you forgotten to ad this:

SceCtrlData pad;
-= Double Post =-

Pretty sure this would work:

 inline void vermenigvuldigen()
{
int upPressed = FALSE; // This initializes "upPressed" //
int downPressed = FALSE;
printf("Druk op pijltje naar boven/beneden om de waarde van het eerste getal te veranderen :%i\n",x);
printf("Druk op pijltje naar links/rechts om de waarde van het tweede getal te veranderen :%i\n",y);
while(1) {
sceCtrlReadBufferPositive (&pad, 1);//start controls
if(pad.Buttons & PSP_CTRL_UP) {
if (!upPressed) {
x++;
pspDebugScreenClear();
vermenigvuldigen();
upPressed = TRUE;
}
}
else {
upPressed = FALSE;
}


if(pad.Buttons & PSP_CTRL_DOWN) {
if (!downPressed) {
x--;
pspDebugScreenClear();
vermenigvuldigen();
downPressed = TRUE;
}
}
else {
downPressed = FALSE;
}




if(pad.Buttons & PSP_CTRL_RIGHT) {
y++;

pspDebugScreenClear();
vermenigvuldigen();

}
if(pad.Buttons & PSP_CTRL_LEFT) {
y--;

pspDebugScreenClear();
vermenigvuldigen();

}
if(pad.Buttons & PSP_CTRL_CROSS) {
pspDebugScreenClear();
printf("het product is: %i\n",x*y);
menu();
}
if(pad.Buttons & PSP_CTRL_TRIANGLE) {
printf(" deze functie is nog niet af");
vermenigvuldigen();
}

}
}

EDIT: Just tested it, worked fine.

not working it does again , x=1,2,3,4,
it only have to do x=1 and x=2if you press again:Cry:

[Waterbottle]

you forgotten to ad this:

SceCtrlData pad;
-= Double Post =-



not working it does again , x=1,2,3,4,
it only have to do x=1 and x=2if you press again:Cry:

try this

inline void vermenigvuldigen()
{
int upPressed = FALSE; // This initializes "upPressed" //
int downPressed = FALSE;
printf("Druk op pijltje naar boven/beneden om de waarde van het eerste getal te veranderen :%i\n",x);
printf("Druk op pijltje naar links/rechts om de waarde van het tweede getal te veranderen :%i\n",y);
while(1) {
sceCtrlReadBufferPositive (&pad, 1);//start controls
if(pad.Buttons & PSP_CTRL_UP) {
if (!upPressed) {
x++;
pspDebugScreenClear();
upPressed = TRUE;
}
}
else {
upPressed = FALSE;
}


if(pad.Buttons & PSP_CTRL_DOWN) {
if (!downPressed) {
x--;
pspDebugScreenClear();
downPressed = TRUE;
}
}
else {
downPressed = FALSE;
}




if(pad.Buttons & PSP_CTRL_RIGHT) {
y++;

pspDebugScreenClear();

}
if(pad.Buttons & PSP_CTRL_LEFT) {
y--;

pspDebugScreenClear();

}
if(pad.Buttons & PSP_CTRL_CROSS) {
pspDebugScreenClear();
printf("het product is: %i\n",x*y);
menu();
}
if(pad.Buttons & PSP_CTRL_TRIANGLE) {
printf(" deze functie is nog niet af");
vermenigvuldigen();
}

}
}

[hallo007]

so the prob is repating something

thnx!!

[psphacker12.]

does anyone have a link to download the JPEG viewer lib?

[Moonchild]

does anyone have a link to download the JPEG viewer lib?

Jpeg's on a PSP is really slow, I would suggest using PNG's. However, GeMP 3.3 has a jpeg viewer, you can download the source code here Source (it's in image.c)

[SG57]

So does FileAssistant's Source =-\

[psphacker12.]

would this restart my game??

if(pad.Buttons & PSP_CTRL_CROSS) {
  break;
}

[Waterbottle]

would this restart my game??

if(pad.Buttons & PSP_CTRL_CROSS) {
  break;
}

ehm. It would break you out of the current loop.

It would only restart the game if you had a loop from the start of the game that ended after the current loop or if you called a function after the loop you break out of.

[Moonchild]

A sceKernelExitGame(); call would exit the game.

[psphacker12.]

ehm. It would break you out of the current loop.

It would only restart the game if you had a loop from the start of the game that ended after the current loop or if you called a function after the loop you break out of.

ok thx.
-= Double Post =-

#include <pspdisplay.h>
#include <pspgu.h>
#include <pspkernel.h>
#include <pspctrl.h>
#include <pspdebug.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
#include <png.h>
#include "graphics.h"
#define printf pspDebugScreenPrintf
#define dprint pspDebugScreenPrintf
#define true 1
#define false !true
#define bool int

PSP_MODULE_INFO("???", 0, 1, 1);

//Standard callbacks
int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}

int i;
int rn0 = (NULL);
int rn1 = (NULL);
int rn2 = (NULL);
bool status = (NULL);
int nums() {
     SceCtrlData pad;
     sceCtrlPeekBufferPositive(&pad, 1);
     srand(sceKernelLibcTime(NULL));
     if (rn0 != (NULL) & rn1 != (NULL) & rn2 != (NULL)) {
       rn0=0
       rn1=0
       rn2=0
     }
     if (pad.Buttons != 0){
          if(pad.Buttons & PSP_CTRL_CROSS) {
           rn0=rand()%3;
           rn0=rand()%3;
           rn0=rand()%3;
          }
     }
     if (rn0 != 3 & rn1 != 3 & rn2 !=3) {
          pspDebugScreenSetXY(0,2);
          pspDebugScreenClear();
          pspDebugScreenSetBackColor(0x00FF0000);
          pspDebugScreenSetTextColor(0x00000000);
          pspDebugScreenPrintf("You won./n");
          pspDebugScreenPrintf("Press 'X' to restart./n");
          if(pad.Buttons & PSP_CTRL_CROSS) {
            nums();
          }
     }
     if(rn0 != 0 & rn1 != 0 & rn2 != 0) {
          pspDebugScreenSetXY(0,2);
          pspDebugScreenClear();
          pspDebugScreenSetBackColor(0x00FF0000);
          pspDebugScreenSetTextColor(0x00000000);
          pspDebugScreenPrintf("Press 'X' to start");
     } else {
       if (pad.Buttons & PSP_CTRL_CROSS) {
          pspDebugScreenSetXY(0, 2);
          pspDebugScreenClear();
          pspDebugScreenSetBackColor(0x00FF0000);
          pspDebugScreenSetTextColor(0x00000000);
          pspDebugScreenPrintf("Generated Integer:%d/n",rn0);
          pspDebugScreenPrintf("Generated Integer:%d/n",rn1);
          pspDebugScreenPrintf("Generated Integer:%d/n",rn2);
          sceDisplayWaitVblankStart();
          sceKernelSleepThread();
       }
     }
}
int main(void) {
          //main functions
          pspDebugScreenInit();
          SetupCallbacks();
          while (1) {
                    //while loop
                    nums();
          }
return 0;
}

it says rn1(undeclared???
how can i fix this?

[Moonchild]

By declaring m1 maybe??

[yaustar]

It would help if you told us the line number.

[GuitarGod1134]

Hi guys i just went to the book store today and saw a book called "C++ For Dummies" I looked through it and it seemed to have a lot of C++ information and it even came with a cd with a compiler and some other useful stuff. So I bought it. Havent started reading it yet but has anyone else gotten this book and was it helpful?

[Bronx]

Usually the "___ for dummies" series have good informataion, but they are very generic. I wouldn't og bought that book myself, but it can't hurt to read it ;)

[GuitarGod1134]

okay. but skimming through it it looks pretty good so i will read it anyways and i guess i read some internet tutorials too. thanks

[Lukeson]

Handling data recieved via TCP

Hi,
On a simple server I'm recieving (and displaying) a string via

    for (;;) {
        len = sizeof(client);
        fd = accept(sock, (struct sockaddr*)&client, &len);
        if (fd < 0)
            error_exit("Fehler bei accept");
        printf("Bearbeite Client mit der Adresse: %s\n", inet_ntoa(client.sin_addr));
        /* Daten vom Client auf dem Bildschirm ausgeben */
        echo ( fd );

        closesocket(fd);
    }

but he outputs the string and the time it was recieved. What I want is to fetch the string (isolated) and save it in a variable. How do I do that?

[psphacker12.]

By declaring m1 maybe??

i have it set up like this..

int rn1 = (NULL);

[Xfacter]

i have it set up like this..

int rn1 = (NULL);

In the case that you are using it, && is supposed to be used for 'and' statements, not &. You're also missing some semicolons.

[Lukeson]

Handling data recieved via TCP

Hi,
On a simple server I'm recieving (and displaying) a string via

    for (;;) {
        len = sizeof(client);
        fd = accept(sock, (struct sockaddr*)&client, &len);
        if (fd < 0)
            error_exit("Fehler bei accept");
        printf("Bearbeite Client mit der Adresse: %s\n", inet_ntoa(client.sin_addr));
        /* Daten vom Client auf dem Bildschirm ausgeben */
        echo ( fd );

        closesocket(fd);
    }

but he outputs the string and the time it was recieved. What I want is to fetch the string (isolated) and save it in a variable. How do I do that?

Solution:

    for (;;) {
        len = sizeof(client);
        fd = accept(sock, (struct sockaddr*)&client, &len);
        if (fd < 0)
            error_exit("Error while accepting");
		
		printf("Accepting connection, IP: %s\n", inet_ntoa(client.sin_addr));
		while(rc!=SOCKET_ERROR)
		{
			rc=recv(fd,buf,256,0);
			if(rc==0)
			{
				printf("Server has closed the connection...\n");
				break;
			}
			if(rc==SOCKET_ERROR)
			{
				printf("Fehler: recv, fehler code: %d\n",WSAGetLastError());
				break;
			}
			buf[rc]='\0';
			printf("Client sendet: %s\n",buf);
			//sprintf(buf2,"Du mich auch %s",buf);
			//rc=send(connectedSocket,buf2,strlen(buf2),0);
		}
        closesocket(fd);

What's the right returntype for char[256]?


Here's another question:

I need to write a function that returns a string of variable length; in fact it's not a string, it's an array of "char"s; What return-type do I have t choose?

[SG57]

Lukeson - What? A 'char' datatype is a character array, or 'buffer'. If you're writing a function returning a char, then have the data type of that function, a char.

As for getting hte length of a given string, either include string.h (or stdlib..hmmm... cant rememmber) and use 'strlen(string)' or:

int
strlen(const char *s)
{
	const char *sc;

	for (sc = s; *sc != '\0'; ++sc)
		;// nothing 

	return sc - s;
}

But i prefer you use the strnlen version, to prevent an overflow. Manual strnlen:

int
strnlen(const char *s, int count)
{
	const char *sc;

	for (sc = s; count-- && *sc != '\0'; ++sc)
		/* nothing */ ;

	return sc - s;
}

So say if you wanted to do a directory listing type thing, the psp screen only hold around 60 characters from left to right, so you may want to limit it.. By using strnlen, you can say only print the filename up to 60... Itd be much more complicated than that, but you really should use strnlen as it prevents an overflow.

[psphacker12.]

Hi guys i just went to the book store today and saw a book called "C++ For Dummies" I looked through it and it seemed to have a lot of C++ information and it even came with a cd with a compiler and some other useful stuff. So I bought it. Havent started reading it yet but has anyone else gotten this book and was it helpful?

Hmm I would reccomend to start out with that book, then later on you can learn the PSP specific syscalls.:)

[SG57]

Yes cause everyone needs to know them in order to create for hte PSP. =-\ [/sarcasm]

[Lukeson]

I'm sorry, I'm stupid and don't get it;
So a char isn't - as I thought - a single character but a buffer for a string? so can I just do this:?

char foo()
{
    char buf[256];

    buf = get_string_from_server();

    return buf;
}

int main()
{
    ...
    printf("%s", foo());
    ...
}

Tested, freezes the PSP

I probably need to clarify my question; I have a function that recieves a string via recv() from the server. I want this string to be the return-value of the function, I just don't know what return-type i need therefor. Ex.:

[???] get_artists(int socket)
{
	long rc;
	char buf[256];

	...

	rc=recv(socket,buf,256,0);
	buf[rc]='\0';
	return buf;
}

[psphacker12.]

Yes cause everyone needs to know them in order to create for hte PSP. =-\ [/sarcasm]

BTW who was that guy who released the tiff game "BRICKS" without your permission? and how did he get his hands onto it?
-= Double Post =-
not working

#include <pspdisplay.h>
#include <pspgu.h>
#include <pspkernel.h>
#include <pspctrl.h>
#include <pspdebug.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
#include <png.h>
#include "graphics.h"
#define printf pspDebugScreenPrintf
#define dprint pspDebugScreenPrintf
#define true 1
#define false !true
#define bool int

PSP_MODULE_INFO("???", 0, 1, 1);

//Standard callbacks
int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}

int funcs() {
  int i;
  int rn0 = (NULL);
  int rn1 = (NULL);
  int rn2 = (NULL);
  bool status = (NULL);
  SceCtrlData pad;
  sceCtrlPeekBufferPositive(&pad, 1);
  srand(sceKernelLibcTime(NULL));
}
int nums() {
     if (rn0 != (NULL) && rn1 != (NULL) && rn2 != (NULL)) {
       rn0=0
       rn1=0
       rn2=0
     }
     if (pad.Buttons != 0){
          if(pad.Buttons && PSP_CTRL_CROSS) {
           rn0=rand()%3;
           rn1=rand()%3;
           rn2=rand()%3;
          }
     }
     if (rn0 != 2 && rn1 != 2 && rn2 != 2) {
          pspDebugScreenSetXY(0,2);
          pspDebugScreenClear();
          pspDebugScreenSetBackColor(0x00FF0000);
          pspDebugScreenSetTextColor(0x00000000);
          pspDebugScreenPrintf("You won./n");
          pspDebugScreenPrintf("Press 'X' to restart./n");
     }
     if (rn0 != 3 && rn1 != 3 && rn2 !=3) {
          pspDebugScreenSetXY(0,2);
          pspDebugScreenClear();
          pspDebugScreenSetBackColor(0x00FF0000);
          pspDebugScreenSetTextColor(0x00000000);
          pspDebugScreenPrintf("You won./n");
          pspDebugScreenPrintf("Press 'X' to restart./n");
          if(pad.Buttons & PSP_CTRL_CROSS) {
            nums();
          }
     }
     if(rn0 != 0 && rn1 != 0 && rn2 != 0) {
          pspDebugScreenSetXY(0,2);
          pspDebugScreenClear();
          pspDebugScreenSetBackColor(0x00FF0000);
          pspDebugScreenSetTextColor(0x00000000);
          pspDebugScreenPrintf("Press 'X' to start/n");
     } else {
       if (pad.Buttons && PSP_CTRL_CROSS) {
          pspDebugScreenSetXY(0, 2);
          pspDebugScreenClear();
          pspDebugScreenSetBackColor(0x00FF0000);
          pspDebugScreenSetTextColor(0x00000000);
          pspDebugScreenPrintf("Generated Integer:%d/n",rn0);
          pspDebugScreenPrintf("Generated Integer:%d/n",rn1);
          pspDebugScreenPrintf("Generated Integer:%d/n",rn2);
          sceDisplayWaitVblankStart();
          sceKernelSleepThread();
       }
     }
}
int main(void) {
          //main functions
          pspDebugScreenInit();
          SetupCallbacks();
          while(1) {
                    //while loop
                    funcs();
                    nums();
          }
return 0;
}

Errors

[email protected] ~
$ cd /pspdev

[email protected] /pspdev
$ make
psp-gcc -I. -I/usr/psp/sdk/include -O2 -G0 -Wall   -c -o main.o main.c
main.c : In function 'funcs':
main.c(50) : warning: initialization makes integer from pointer without a cast
main.c(51) : warning: initialization makes integer from pointer without a cast
main.c(52) : warning: initialization makes integer from pointer without a cast
main.c(53) : warning: initialization makes integer from pointer without a cast
main.c(53) : warning: unused variable 'status'
main.c(52) : warning: unused variable 'rn2'
main.c(51) : warning: unused variable 'rn1'
main.c(50) : warning: unused variable 'rn0'
main.c(49) : warning: unused variable 'i'
main.c : In function 'nums':
main.c(59) : error: 'rn0' undeclared (first use in this function)
main.c(59) : error: (Each undeclared identifier is reported only once
main.c(59) : error: for each function it appears in.)
main.c(59) : error: 'rn1' undeclared (first use in this function)
main.c(59) : error: 'rn2' undeclared (first use in this function)
main.c(61) : error: syntax error before 'rn1'
main.c(64) : error: 'pad' undeclared (first use in this function)
make: *** [main.o] Error 1

[email protected] /pspdev
$

[yaustar]

GuitarGod1134:
Don't get that book, they are usually pretty poor in my opinion.

Take a read through this online book:
http://www.ibiblio.org/obp/thinkCS/cpp/english/

And consider buying this one:
http://www.amazon.co.uk/gp/product/1...649123-1896422

Lukeson:

[???] get_artists(int socket)
{
	long rc;
	char buf[256];

	...

	rc=recv(socket,buf,256,0);
	buf[rc]='\0';
	return buf;
}

The correct return type would be a char pointer:

char * get_artists(int socket)
{
	long rc;
	char buf[256];

	...

	rc=recv(socket,buf,256,0);
	buf[rc]='\0';
	return buf;
}

However this will throw a runtime error:

char buffer[256];
buffer = get_artists(6666);
printf("%s", buffer);

This is because the buf that was in the function was created locally on the stack and the function returns a pointer to it. However, after the pointer assignment to buffer, it is removed from the stack since it is no longer in scope and now pointer is pointing to garbarge. A better method would be to do:

void get_artists(int socket, char * recivedMessage)
{
	long rc;
	...

	rc=recv(socket,recivedMessage,256,0);
	recivedMessage[rc]='\0';
	return recivedMessage;
}

int main()
{
    char buffer[256] = "";
    get_artists(6666, buffer);
    printf("%s", buffer);
    ...
}

-= Double Post =-
psp12.:

main.c(50) : warning: initialization makes integer from pointer without a cast
main.c(51) : warning: initialization makes integer from pointer without a cast
main.c(52) : warning: initialization makes integer from pointer without a cast
main.c(53) : warning: initialization makes integer from pointer without a cast

You are assigning non pointer variables NULL. NULL is usually #defined as 0 and should be reserved for pointers only hence a warning rather then an error. Just give them the value 0.

  int rn0 = 0; 
  int rn1 = 0;
  int rn2 = 0;

main.c(53) : warning: unused variable 'status'
main.c(52) : warning: unused variable 'rn2'
main.c(51) : warning: unused variable 'rn1'
main.c(50) : warning: unused variable 'rn0'
main.c(49) : warning: unused variable 'i'

You didn't use any of the variables in the function funcs().

main.c : In function 'nums':
main.c(59) : error: 'rn0' undeclared (first use in this function)
main.c(59) : error: (Each undeclared identifier is reported only once
main.c(59) : error: for each function it appears in.)
main.c(59) : error: 'rn1' undeclared (first use in this function)
main.c(59) : error: 'rn2' undeclared (first use in this function)
main.c(64) : error: 'pad' undeclared (first use in this function)

None of these variables have been decleared in scope of the function nums().

main.c(61) : error: syntax error before 'rn1'

You forgot ';' on the line before.

[psphacker12.]

None of these variables have been decleared in scope of the function nums().

main.c(61) : error: syntax error before 'rn1'

You forgot ';' on the line before.

How can I fix that?

[yaustar]

Great idea, quote the entire post for one small part of it (-_-;)

int nums() {
     if (rn0 != (NULL) && rn1 != (NULL) && rn2 != (NULL)) {
       rn0=0
       rn1=0
       rn2=0
     }

int nums() {
   int rn0=0;
   int rn1=0;
   int rn2=0;
   SceCtrlData pad;

Here is another tip, buy this book:
The C programming Language or this one Beginning C++ Game Programming or at LEAST read this online one: Thinking like a computer scientist [C++]