hdu1002

题目意思:计算两个大整数的和

http://acm.hdu.edu.cn/showproblem.php?pid=1002

AC代码:

#include<iostream>

#include<string>

using namespace std;

string add(string s1,string s2){//字符串模拟大数加法,

string s;

int len1,len2;

len1=s1.size()-1; len2=s2.size()-1;

int i=0,flag=0;

while(len1>-1&&len2>-1){

int sum=flag+(s1[len1--]-‘0‘)+(s2[len2--]-‘0‘);

s+=char ((sum)%10+‘0‘);

flag=sum/10;

}

while(len1>-1){

int sum=flag+(s1[len1--]-‘0‘);

s+=char ((sum)%10+‘0‘);

flag=sum/10;

}

while(len2>-1){

int sum=flag+(s2[len2--]-‘0‘);

s+=char ((sum)%10+‘0‘);

flag=sum/10;

}

if(flag) s+=char (‘0‘+flag);

//cout<<s<<endl;

for(int i=0;i<s.size()/2;i++){

char c=s[i];

s[i]=s[s.size()-i-1];

s[s.size()-i-1]=c;

}

return s;

}

int main()

{

int t,k=0;

string a,b;

cin>>t;

while(t--){

cin>>a>>b;

cout<<"Case "<<++k<<":"<<endl;

cout<<a<<" + "<<b<<" = "<<add(a,b)<<endl;

if(t) cout<<endl;

}

return 0;

}