Torque conversion limit in C

Question

I developed this code in C for conversion from integer to binary, but the limit is 1023. Any number above this, the conversion ceases to be performed

Why and possible solution?

int binario(int num) {

    if (num == 0)
        return 0;
    return (num % 2) + 10 * binario(num / 2);

}

int main(){

    printf("%d",binario(7));
}

Answer 1

The problem is that it’s returning one int which has a limited capacity. I changed the code to use long which will allow larger numbers. But it has limit too.

So what’s the problem? Trying to make a numerical representation as if it were a number. The number is the number, you do math with it. The numerical representation is what you see written. It’s a text that happens to have numeric digits written down, but that’s not a number.

You don’t do accounts with representations. And showing the number in binary is just a representation. Just like what you see on the screen is usually just a decimal representation.

If you really want to create a binary representation, generate a text and not a number, change the return to char * and encode in an appropriate way to generate the text. As was done in another question.

#include <stdio.h>

long binario(int num) {
    if (num == 0) return 0;
    return (num % 2) + 10 * binario(num / 2);
}

int main() {
    printf("%ld", binario(1025));
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.