dec to bin

#include <stdio.h>

void dtob(unsigned int n);

int main(int argc, char **argv) {
        dtob(atoi(argv[1]));
}

void dtob(unsigned int n) {
        char i=0;
        do putchar((n>>31&1)+'0');while((n<<=1)|++i<32);
        putchar(10);
}