inverte bits

#include <stdio.h>

void dtob(unsigned int n);

int main(void) {

        dtob((char)-100);
        printf("%p\n", (char)-100);
        dtob((unsigned char)-100);
        printf("%p\n", (unsigned char)-100);
        dtob((short int)-100);
        printf("%p\n", (short int)-100);
        dtob((unsigned short int)-100);
        printf("%p\n", (unsigned short int)-100);
        dtob((int)-100);
        printf("%p\n", (int)-100);
        dtob((unsigned int)-100);
        printf("%p\n", (unsigned int)-100);
        return 0;
}

int invertebits(x, p, n) unsigned x, p, n; {
        //while(n--)x>>--p&1?x&=~(1<<p):(x|=1<<p);
        return x^~(~0<<n)<<p-n;
}

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