HDU 1002

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

int main()
{   int T;
char s1[1010],s2[1010];
cin>>T;
for(int q=1;q<=T;q++){

int k,i,j;
int l1,l2;

int a[1200]={0};
int b[1200]={0};

scanf("%s%s",s1,s2); //OJ是空格输入的，用gets是回车转换下一组数据，按照OJ的标准gets读取了空格发生了错误RE，所以用scanf

l1=strlen(s1);
l2=strlen(s2);

if(l1>=l2)
k=l1;
else
k=l2;

for(i=k,j=l1-1;j>=0;i--,j--)
a[i] = s1[j]-'0';

for(i=k,j=l2-1;j>=0;i--,j--)
b[i] = s2[j]-'0';

for(i=k;i>0;i--){
a[i]+=b[i];
if(a[i]>9){
a[i]-=10;
a[i-1]++;}
}

cout<<"Case "<<q<<":"<<endl;
printf("%s + %s = ",s1,s2);
if(a[0]){
for(i=0;i<=k;i++){

cout<<a[i];}}

else{
for(i=1;i<=k;i++){
cout<<a[i];}
}
cout<<endl;
if(q!=T)
cout<<endl;
}
}