Something

#include <stdio.h>#include <stdlib.h> int main(void){        int n,r,i,j,a[100];        i=0;        printf("Ingresa el numero: ");        scanf("%d", &n);        while(n != 0) {                a[i] = n%2;                n=n/2;                i++;                }                for(j = i-1; j>=0; j--){                      printf("%d",a[j]);}for (r=j;r>=0;r--){    if(a[r]==1)               a[r]=0;    else               a[r]=1;        printf("caca %d", a[r]);}system("pause");}