forums.ps2dev.org

plebihan · Joined: 16 Jul 2006 Posts: 10

Hi all,

i would like to create a function that returns the binary representation of a decimal in a string. i tried many think but i didn't succed .

An other point i can't load the iostream header in /usr/include/pspdev/include/c++/4.1.0 cause it returns error. Is it the good file or must i search it in an other directory ?
Thanx for your help ,

Best regards

Here is a sample of my code :

Jim · Joined: 02 Jul 2005 Posts: 487 Location: Sydney

The PSP is almost certainly not the best platform to start learning to program C.

Jim
_________________
http://www.dbfinteractive.com

Art · Joined: 09 Nov 2005 Posts: 647

willow :--) · Joined: 13 Jan 2007 Posts: 126

J.F. · Joined: 22 Feb 2004 Posts: 2906

The remainder var isn't initialized in the case the if() code block is executed. This means that it will have an undefined value that will almost certainly cause a buffer overflow in the sprintf() as resultat is only 5 characters long, but the %X can generate up to eight characters.

You should define them as

int remainder = 0;
char resultat[9];

You need an extra char in resultat for the null terminating byte.

plebihan · Joined: 16 Jul 2006 Posts: 10

Ok thank you for your advices but what about the iostream header. Can it be used in PSP programmation ?

Thanx
Pacopad

Jim · Joined: 02 Jul 2005 Posts: 487 Location: Sydney

Why are you including iostream? Do you need it for some other part of your program? The code snippet you posted only needs stdio.h. Perhaps you're actually building a C++ program, or you're using the C compiler by mistake?

Good places to start with C and/or C++.
Windows:
DevC++
Visual Studio Express
Linux:
GCC

Jim
_________________
http://www.dbfinteractive.com

J.F. · Joined: 22 Feb 2004 Posts: 2906

If you really insist on learning on the PSP, look at the example programs that come with the SDK. To check out the full SDK, use subversion (or a subversion client on Windows) to get it like this:

Art · Joined: 09 Nov 2005 Posts: 647

plebihan · Joined: 16 Jul 2006 Posts: 10

Ok , with a little of change and some functions that i picked on the web my first hombrew begin to work. it's an app to control an IR helicopter "the picooz".. After some code lines , i could start the graphic part.

Thanx for you help
Pacopad

Alberto · Joined: 12 Feb 2007 Posts: 57 Location: Sofia

well, TTYTT I just think the following:

1. you're heading for a binary representation of a number, while you're using %X which is HEX representation...
2. your code has an IF statement, while it should have had a WHILE one...

Cheers, A.

Alberto · Joined: 12 Feb 2007 Posts: 57 Location: Sofia

So,

try like the following

#include <stdio.h>
#include <string.h>
#include <malloc.h>

void tobin(int i, char sBinary[])
{
char *sTemp = (char*)malloc(100);
strcpy(sTemp, "\0");
while (i)
{
if (i % 2)
strcat(sTemp, "1");
else
strcat(sTemp, "0");
i /= 2;
}
for(int n = 1; n <= strlen(sTemp); n++)
sBinary[n - 1] = sTemp[strlen(sTemp) - n];
sBinary[strlen(sTemp)] = '\0';
free(sTemp);
}

int main(void)
{
char s1[20];
tobin(0xAA55, s1); // 1010 1010 0101 0101
printf("%s\n", s1);
}