大佬求助！！

#include <bits/stdc++.h>
using namespace std;

int change(string s){
	int d;
	stringstream sin;
	sin<<s;
	sin>>d;
	return d;
}
string find(string s){
	string t="";
	for(int i=0;i<s.size();i++){
		if(isdigit(s[i])){
			t+=s[i];
		}else if(t!=""){
			return t;
		}
	}
	return "";
}
int findl(string s){
	for(int i=0;i<=s.size();i++){
		if(isdigit(s[i]))
			return i;
	}
	return -1;
}
int findr(string s){
	for(int i=findl(s);i<=s.size();i++){
		if(!isdigit(s[i+1]))
			return i;
	}
	return -1;
}
int main() {
	string s;
	int n;
	cin>>n;
	char ch;
	getchar();
	for(int i=1;i<=n;i++){
		getline(cin,s);
		char t[1000];
		if(s[0]>='a'&&s[0]<='c')ch=s[0];
		int l,r;
		l=change(find(s));
		s.erase(0,findr(s)+2);
		r=change(s);
		switch(ch){
			case 'a':
				sprintf(t,"%d+%d=%d",l,r,l+r);
				break;
			case 'b':
				sprintf(t,"%d-%d=%d",l,r,l-r);
				break;
			case 'c':
				sprintf(t,"%d*%d=%d",l,r,l*r);
				break;
		}
		cout<<t<<endl<<strlen(t)<<endl;
	}
	return 0;
}