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题意：大数加法的模拟题

AC代码如下：

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<queue>
using namespace std;

int main()
{
	//freopen("e:\\input.txt","r",stdin);
	//freopen("e:\\output.txt","w",stdout);
	char s1[1010],s2[1010],s3[1010],*q;
	int i,j,k,t,Ls1,Ls2,Ls3,C1,C2,Q,len;
	cin>>t;
	for(k=1;k<=t;k++)
	{
		cin>>s1>>s2;
		cout<<"Case "<<k<<":"<<endl;
		cout<<s1<<" + "<<s2<<" = ";
		Ls1=strlen(s1);
		Ls2=strlen(s2);
		i=Ls1-1;
		j=Ls2-1;
		Q=len=0;
		while(i>=0 || j>=0)
		{
			C1=C2=0;
			if(i>=0)
			{
				C1=s1[i]-'0';
				i--;
			}
			if(j>=0)
			{
				C2=s2[j]-'0';
				j--;
			}
			s3[len++]=(C1+C2+Q)%10+'0';
			Q=(C1+C2+Q)/10;
		}
		if(Q) s3[len++]=Q+'0';
		s3[len]=0;
		q=s3;
		q=strrev(q);
		cout<<s3<<endl;
		if(k!=t)
			cout<<endl;
	}
	return 0;
}