obtem bits

#include <stdio.h>

void dtob(unsigned int n);

int main(void) {

        dtob(6);
        dtob(obtembits(6, 2, 1));
        //printf("%d\n", );
        return 0;
}

int obtembits(x, p, n) unsigned int x, p, n; {//numera da direita pra esquerda
        return (unsigned)x<<32-p>>32-n;
}

int obtembits2(x, p, n) unsigned int x, p, n; {//numera da esquerda pra direita
        return (unsigned)x<<p>>32-n;
}

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