大整数加法

#include<cmath>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
const int maxn = 1000;
int a[maxn];
int b[maxn];
int c[maxn];
char s[maxn];
char t[maxn];
int main(void)
{
    cin>>s;
    cin>>t;
    int lens = strlen(s);
    int lent = strlen(t);
    for(int i = 0; i < lens; i++)
        a[lens-i] = s[i]-‘0‘;
    for(int i = 0; i < lent; i++)
        b[lent-i] = t[i]-‘0‘;
    int lenc = 1;
    int x = 0;
    while(lenc<=lens||lenc<=lent)
    {
        c[lenc] = a[lenc]+b[lenc]+x; 
        x = c[lenc]/10;
        c[lenc] = c[lenc]%10;
        lenc++;
    }
    c[lenc] = x;
    while(c[lenc]==0)
        lenc--;
    for(int i = lenc; i >= 1; i--)
        cout<<c[i];
    cout<<endl;
    return 0;
}