【c语言】记录出错的结果题

#include<stdio.h>
void main(){

  int a[12] = {76,63,54,62,40,75,80,92,77,84,44,73};
  int b[4] = {60,70,90,101};
  int c[4] = {0};
  int i,j;
  for(i=0;i<12;i++){
    j=0;
    while(a[i]>=b[j])
      j++;
    c[j]++;

  }

  for(i=0;i<4;i++)
    printf("%d",c[i]);
  printf("\n");


}

​输出结果是3261​