全WA，样例能过，求指点

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
string s;
int n,l;
int ans=2,i;
int a,b;
char x;
void init()
{
	a=0;
	b=0;
	ans=2;
	i=0;
}
void add()
{
	//printf("%d+%d=%d\n",a,b,a+b);
	cout<<a<<"+"<<b<<"="<<a+b<<endl;
	int c=a+b;
	while(c!=0)
	{
		c/=10;
		ans++;
	}
	//printf("%d\n",ans);
	cout<<ans<<endl;
}
void reduce()
{
	//printf("%d-%d=%d\n",a,b,a-b);
	cout<<a<<"-"<<b<<"="<<a-b<<endl;
	int c=a+b;
	if(c<=0)ans++;
	while(c!=0)
	{
		c/=10;
		ans++;
	}
	//printf("%d\n",ans);
	cout<<ans<<endl;
}
void mutiply()
{
	//printf("%d*%d=%d\n",a,b,a*b);
	cout<<a<<"*"<<b<<"="<<a*b<<endl;
	long long c=a*b;
	while(c!=0)
	{
		c/=10;
		ans++;
	}
	//printf("%d\n",ans);
	cout<<ans<<endl;
}
int main()
{
	cin>>n;
	while(n--)
	{
		init();
		getline(cin,s);
		l=s.length();
		if(s[0]>='a'&&s[0]<='c')x=s[0],i=2;
		for(;i<l;i++)
		{
			if(s[i]==' ')break;
			a*=10;
			a+=s[i]-48;
			ans++;
		}
		for(i+=1;i<l;i++)
		{
			b*=10;
			b+=s[i]-48;
			ans++;
		}
		switch(x)
		{
			case 'a':
				add();
				break;
			case 'b':
				reduce();
				break;
			case 'c':
				mutiply();
				break;
		}
	}
 	return 0;
}