hdu/hdoj 1002 A + B Problem II

这种题一看就知道是大数问题，可能需要的是前导‘0’的处理。注意处理格式，这样一般就ac了

#include <iostream>
#include <cstring>
#include <string>
#include <stdio.h>
using namespace std;

string Add(string fNum,string sNum)
{
        if( fNum.length() < sNum.length() ) fNum.swap(sNum);
        string A = "0";
        A += fNum;
        for ( int i=1;i<=fNum.length();i++)
                if(i<=sNum.length())
                        A[A.length()-i]+=sNum[sNum.length()-i]-'0';
        for( int i=1;i<A.length();i++)
        {
                if(A[A.length()-i]>'9')
                { A[A.length()-i]-=10;A[A.length()-i-1]+=1; }
        }
        while(A[0]=='0') A.erase(0,1);
        return A;
}


int main ()
{
	string a,b;
	int t;
	cin>>t;
	int ncount=1;
	int flag=false;
	while (t--)
	{
		cin>>a>>b;
		string re=Add(a,b);
		if (flag==true)
			cout<<endl;
		if (flag==false)
		{
			flag=true;
		}
		printf("Case %d:n",ncount++);
		cout<<a<<" + "<<b<<" = "<<re<<endl;
		
	}
}