C++实现的大数减法

#include<stdio.h>
#include<string.h>
#define MAX 110
char ac[MAX],bc[MAX];
int a[MAX],b[MAX],c[MAX];
int bigger(int a[],int len1,int b[],int len2){
int i = 0;
if(len1>len2)
return 1;
if(len1<len2)
return 0;
while(i<len1 && a[i] == b[i])
++i;
if(i == len1)
return 2;
if(a[i]>b[i])
return 1;
return 0;
}
void reverse(int a[],int len){
int f = 0,l = len-1,t;
while(f<l){
t = a[f];
a[f] = a[l];
a[l] = t;
++f;
--l;
}
}
void add(int a[],int b[],int len1,int len2,int fuhao){