求助

#include <bits/stdc++.h>
using namespace std;
int shua,shub;
void quyou(string a){
    int i=2;
    shua=0;
    shub=0;
    for(i=2;a[i]!=' ';i++){
        shua=shua*10+a[i]-'0';
    }
    for(i++;i<a.size();i++){
        shub=shub*10+a[i]-'0';
    }
}
void qumei(string a){
    int i=2;
    shua=0;
    shub=0;
    for(i=0;a[i]!=' ';i++){
        shua=shua*10+a[i]-'0';
    }
    for(i++;i<a.size();i++){
        shub=shub*10+a[i]-'0';
    }
}
int size(int a ,int b,int he){
    int jishu=0;
    if(a<0){
        a*=-1;
        jishu++;
    }
    while(a!=0){
        jishu++;
        a/=10;
    }
    if(b<0){
        b*=-1;
        jishu++;
    }
    while(b!=0){
        jishu++;
        b/=10;
    }
    if(he<0){
        he*=-1;
        jishu++;
    }
    while(he!=0){
        jishu++;
        he/=10;
    }
    jishu++;jishu++;
    return jishu;
}
int main(){
    int n;
    cin>>n;
    string a;
    int i;
    char yun;
    getline(cin,a);
    for(i=0;i<n;i++){
        getline(cin,a);
        if(a[0]>='a' && a[0]<='c'){
            yun=a[0];
            quyou(a);
        }else{
            qumei(a);
        }
        switch(yun){
            case 'a':
                cout<<shua<<"+"<<shub<<"="<<shua+shub<<endl;
                cout<<size(shua,shub,shua+shub)<<endl;
                break;
            case 'b':
                cout<<shua<<"-"<<shub<<"="<<shua-shub<<endl;
                cout<<size(shua,shub,shua-shub)<<endl;
                break;
            case 'c':
                cout<<shua<<"*"<<shub<<"="<<shua*shub<<endl;
                cout<<size(shua,shub,shua*shub)<<endl;
                break;

        }

    }
    return 0;
}