C/C++ Programming Help Thread

[Cheez Pirate]

I'm uhh... Begining this C++ stuff. Need some help here. Just making a little thingy to see what I know. :\

#include <iostream.h>
int main() {
int theYear = 2006;
return 0;
}
int main() {
int myBirthYear = 1992;
return 0;
}
int main() {
int myAge = << theYear - myBirthYear << endl;
cout << "My age is " << myAge << endl;
return 0;
}
-= Double Post =-
Oh. And I don't understand the compiler errors on Dev-Cpp... :\

[Access_Denied]

#include <iostream.h>
int main() {
int theYear = 2006;
int myBirthYear = 1992;
int myAge = << theYear - myBirthYear << endl;
cout << "My age is " << myAge << endl;
return 0;
}

I know nothing of C++. But from coding C on the PSP, something tells me it should be more like that.

[Cheez Pirate]

Wow. I just realized how stupid I am. Even though it doesn't work. Need more help please lol.
-= Double Post =-
I think my only problem is subtracting. I didn't know how so I took a guess. Someone tell me how to subtract?

[Grimfate126]

Wow. I just realized how stupid I am.

its ok. my first program in C was similar to this:

int 5;

void main(x)
{

print("what is int?" " int is int")

end

}

BTW, i got my problem fixed.

[Access_Denied]

#include <iostream>
using namespace std;

int main () {
  int currentYear, myBirthYear;
  int myAge;
  currentYear = 2006;
  myBirthYear = 1992;
  myAge = currentYear - myBirthYear;
  cout << myAge;
  return 0;
}

Try that.

[Cheez Pirate]

Oh. Ok, hang on. By the way. What's the difference between C, and C++?

[Access_Denied]

Oh. Ok, hang on. By the way. What's the difference between C, and C++?

I edited the code because I seen a mistake. So if it doesn't work, try the new code. And the only only difference between them is syntax. It's the only difference between all languages. They all work the same way. You just have to know the 'words' the language should be written in.

[Cheez Pirate]

Thanks. That worked! And I understand it too. Thanks a lot!

[Access_Denied]

I think the problem was that you forgot using namespace std;. But as I said, I'm no expert.

[Cheez Pirate]

:o Also. Is there a main loop? I run it and it disapears right away.

[Access_Denied]

I don't know. I just modified this code from a tutorial.

// operating with variables

#include <iostream>
using namespace std;

int main ()
{
// declaring variables:
int a, b;
int result;

// process:
a = 5;
b = 2;
a = a + 1;
result = a - b;

// print out the result:
cout << result;

// terminate the program:
return 0;
}

[Grimfate126]

:o Also. Is there a main loop? I run it and it disapears right away.

do this:

int main() {     // your main function //

while (1) {

// the printing stuff here//

sceDisplayWaitVblankStart();
flipScreen();
}

sceKernelSleepThread(); 
return 0;

}

that basically says, "wait forever." :)

[Cheez Pirate]

Ok. Guess I gotta get rid of "return 0;"
-= Double Post =-
Or that lol.

[Grimfate126]

I don't know. I just modified this code from a tutorial.

// operating with variables

#include <iostream>
using namespace std;

int main ()
{
// declaring variables:
int a, b;
int result;

// process:
a = 5;
b = 2;
a = a + 1;
result = a - b;

// print out the result:
cout << result;

// terminate the program:
return 0;
}

propel, stop leading him towards computer C++. i understand that your trying to help, but comp. and psp stuff is very different. for one, in psp, you dont need to put:

using namespace std

and you need a loop, just like in lua.

[Access_Denied]

do this:

int main() {     // your main function //

while (1) {

// the printing stuff here//

sceDisplayWaitVblankStart();
flipScreen();
}

sceKernelSleepThread(); 
return 0;

}

that basically says, "wait forever." :)

He's coding for the PC.

[Grimfate126]

He's coding for the PC.

then why is it in this section?

[Access_Denied]

then why is it in this section?

Because it's the C/C++ Development thread. Maybe he's practicing coding for the PSP.

[Cheez Pirate]

Ya. I'm using it on both.
-= Double Post =-
Like learning both at the same time. Functions for PSP, and comp.

[Grimfate126]

Ya. I'm using it on both.
-= Double Post =-
Like learning both at the same time. Functions for PSP, and comp.

ok. im just warning you that you may get confused. try to learn one thing. then use it for another. (ur choice.)

[Cheez Pirate]

lol ok. Well I saved the PSP main loop in a txt doc. Now I need the loop for the computer if there is one. Coz when I run it. It still shuts itself off after like a milisecond.

[Grimfate126]

lol ok. Well I saved the PSP main loop in a txt doc. Now I need the loop for the computer if there is one. Coz when I run it. It still shuts itself off after like a milisecond.

i dont know much about comp c++. use google.

[Moonchild]

Just put system("PAUSE"); right before the return 0;

Oh, and you don't have to put using namespace std; you simply can write std::cout, std::cin ... instead.

[Lukeson]

Ok, youresame told me to tell you this

>

Not sure what it means, do you?....

No Idea, but tell him this: < !!

It's faster to blit the arrows separately.

Seriuosly? Why is that?

[Zettablade]

Ya. I'm using it on both.
-= Double Post =-
Like learning both at the same time. Functions for PSP, and comp.

I wouldn't do that. That's just settign yourself up towards failure. Just learn c. And I really wouldn't recommend learning on the pc, seeing as it's actually easier to code on the psp then the pc. :P

[yaustar]

Zettablade: That is a matter of opinion. I find it a hell of a lot easier to program something with C++ then C. Strip away all the libraries and I pick C++ with classes, strict type safety, const correctness and template metaprogramming over C structs and macros any day of the week.

I also disagree about learning straight away on a PSP/DS/any hardware platform. Trying to get your head round the SDK/toolchain AND learning how to program at the same time can be extremely difficult to do for a new programmer. However, I agree that you should only develop for one platform then move on to the next.

[Moonchild]

Seriuosly? Why is that?

I think that's what youresam tried to tell you too.

The reason it's faster is because it doesn't have to go through as many pixels. Just think about it, the large image contains 480*272 pixels, while the arrows contain like 5*5+5*5+5*5 ...

[Lukeson]

i c... (even though the image is only 5*260, still true)

[yaustar]

In addition, you are using less memory to store the image of one arrow.

[Lukeson]

Getting an error google doesn't have an answer for:

I got a round fuction from http://www.cs.tut.fi/~jkorpela/round.html . I included <limits.h> as written on the page. The error I get is

main.c:(.text+0x2c): undefined reference to `assert'
main.c:(.text+0x4c): undefined reference to `assert'

The code is

long round(double x) {
	assert(x >= LONG_MIN-0.5);
	assert(x <= LONG_MAX+0.5);
	if (x >= 0)
		return (long) (x+0.5);
	return (long) (x-0.5);
}

[yaustar]

You need to #include <assert.h> where you use the function assert. (#include <cassert> if you are using C++).