Decimal to Binary

Question

I have a number that I would like to convert to binary (from decimal) in C.

I would like my binary to always be in 5 bits (the decimal will never exceed 31). I alrea

Answer 1

Here is C program to convert decimal to binary using bitwise operator with any decimal supported by system and holding only the required memory

#include 
#include 
#include 
int main (int argc, char **argv) 
{
    int n, t = 0;
    char *bin, b[2] = ""; 
    scanf("%d", &n);
    bin = (char*)malloc(sizeof(char) + 2);
    while (n != 0)
    {
        t = n >> 1;
        t = t << 1;
        t = n - t;
        n = n >> 1;
        itoa(t, b, 10);
        bin = realloc((char*)bin, sizeof(char) + 1);
        strcat(bin, b);
    }
    strrev(bin);
    printf("\n%s\n", bin);

    return 0 ;
}