Print bits of unsigned char

print_var_bits.c

//This program enable you to see bit of variable(char and int).

#include <stdio.h>

void printbits(unsigned char v) {
        int i; // for C89 compatability
        for(i = 7; i >= 0; i--) putchar('0' + ((v >> i) & 1));
}

void printbits_int(int v) {//for 32bit variable
        int i,j;
        for(i=8*sizeof(int)-1; i >= 0; ) {
                for(j=4; j>0; j--) {
                        putchar('0' + ((v >> i) & 1));
                        i--;
                }
                putchar(' ');
        }
}
void main(){
        printf("This program enable you to see bit of variable.\n");
        printf("Ener one character you want see its bit(= ascii code).\n");
        char x=getchar();
        printbits(x);

        printf("\nEner variable(int) you want see its bit.\n");
        int y=0;
        scanf("%d",&y);
        printbits_int(y);
}