gistfile1.c

#include <stdio.h>

//This is a simple program that counts from 0 to 63 in a loop without conditional statements or use of modulo

int main(void) {

    int i=0;
    int cntr=0;
    
    // 0x3f = 0011 1111
    // 64   = 0100 0000

    // Whatever is on the right of bit #7 is kept. 
    // When bit #7 is set and the rest is not (i is divisible by 64) no bits are equal and so the result is 0

    while(1) {
        cntr = (++i & 0x3f);
        printf("%d\n",cntr);
    }

    return 0;
}