杭电1002-模板2-用string

#include <iostream>#include <cstring>using namespace std;string Add(string a,string b){int i,j,sum=0;if(a.length()<b.length())swap(a,b);for(i=a.length()-1,j=b.length()-1;i>=0;i--,j--){sum+=a[i]-'0';if(j>=0)sum+=b[j]-'0';a[i]=sum%10+'0';sum/=10;}if(sum)a='1'+a;return a;}int main(){int T,Case=0;string s1,s2;cin>>T;while(T--){cin>>s1>>s2;cout<<"Case "<<++Case<<":"<<endl;cout<<s1<<" + "<<s2<<" = ";s1=Add(s1,s2);cout<<s1<<endl;if(T!=0)cout<<endl;}return 0;}