#include<bits/stdc++.h>
using namespace std;
char A[10001],B[10001];
int a[10001],b[10001],c[100001];
int main(){
cin>>A>>B;
int lena=strlen(A);
int lenb=strlen(B);
int x=0;
int lenc;

for(int i=0;i<=lena-1;i++){
a[i]=A[lena-1-i]-'0';
}
for(int i=0;i<=lenb-1;i++){
b[i]=B[lenb-1-i]-'0';
}

int i;
for(i=0;i<=lena-1||i<=lenb-1;i++){
c[i]=a[i]+b[i]+x;
x=c[i]/10;
c[i]=c[i]%10;
}
lenc=i;
c[lenc]=x;
while(c[lenc]==0&&lenc>0){
lenc--;
}
for(i=lenc;i>=0;i--){
cout<<c[i];
}
return 0;

语言C++98

#include<iostream>
#include<string>
using namespace std;
int main()
{
    string sd,se,sa;
    int a[100001]{0},b[100001]{0},c[100001]{0},mc,me,mz,n,mo=0;
    cin>>sd>>se;
    mc=sd.size();
    me=se.size();
    if(mc<me||mc==me&&sd<se){sa=sd;sd=se;se=sa;n=mc;mc=me;me=n;mo=-1;} 
    for(int i=1;i<=mc;i++) a[i]=sd[mc-i]-'0';
    for(int i=1;i<=me;i++) b[i]=se[me-i]-'0';
    int i=1,o=0;
    while(i<=mc||i<=me)
    {
        if(a[i]<b[i]){a[i+1]--;a[i]+=10;}
        c[i]=a[i]-b[i];
        i++;
    }
    mz=i;while(c[mz]==0&&mz>1)mz--;
    if(mo==-1) cout<<"-";
    for(int i=mz;i>=1;i--) cout<<c[i];
    return 0;
}

#以下编程语言为Python3

a = input("") b = input("") a = int(a) b= int(b) print(a+b)