https://www.luogu.org/problem/P1601
#include <iostream>
#include<bits/stdc++.h>
using namespace std;
int a[1000],b[1000],c[1000];
void read(int a[]){
string s;
cin>>s;
int len = s.size();
a[0] = len;
for(int i=0;i<len;i++){
a[len-i] = s[i]-'0';
}
}
void out(int a[]){
for(int i=a[0];i>=1;i--){
cout<<a[i];
}
cout<<endl;
}
void calc(){
memset(c,0,sizeof c);
int len = max(a[0],b[0]);
int tmp = 0;
int top=1;
for(int i=1;i<=len;i++){
c[i] = a[i]+b[i]+tmp;
tmp = c[i]/10;
c[i]%=10;
// top++;
}
if(tmp!=0)c[++len] = tmp;
c[0] = len;
}
int main()
{
//string a,b;
// cin>>a>>b;
read(a);
read(b);
// out(a);
// out(b);
calc();
out(c);
return 0;
}bLue的除法：
#include <iostream>
#include<bits/stdc++.h>
using namespace std;
int main()
{
int a,b;
while(cin>>a>>b)
{
// cin>>a>>b;
if(a==0||b==0)break;
vector<int>demo;
int integer = a/b;
a = (a%b)*10;
while(a){
demo.push_back(a/b);
a = (a%b)*10;
}
int h = demo.size();
printf("%d",integer);
if(h>0)
{
printf(".");
for(int i=0;i<h;i++){
printf("%d",demo[i]);
}
}
cout<<endl;
}
return 0;
}