Problem Description

I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B.

Input

The first line of the input contains an integer T(1<=T<=20) which means the number of test cases. Then T lines follow, each line consists of two positive integers, A and B. Notice that the integers are very large, that means you should not process them by using 32-bit integer. You may assume the length of each integer will not exceed 1000.

Output

For each test case, you should output two lines. The first line is "Case #:", # means the number of the test case. The second line is the an equation "A + B = Sum", Sum means the result of A + B. Note there are some spaces int the equation. Output a blank line between two test cases.

C:

#include<stdio.h>  
#include<string.h>  
int main()  
{  
    char a[2005];   //a,b接收加数   
    char b[2005];  
    int ans[2005];  //存储相加结果   
    int t,flag;  
    int index=1;  
    int len1,len2;  
    scanf("%d",&t);  
    while(t--)  
    {  
        memset(ans,0,sizeof(ans));  //每次赋零   
        scanf("%s%s",a,b);  
        len1=strlen(a);  
        len2=strlen(b);  
        int i=len1-1;   //i，j分别指向a，b待处理的位置。   
        int j=len2-1;  
        int p=0;    //指向ans中待处理的位置   
          
        while(i>=0 && j>=0)       //做加法运算 ，直到一个字符串被算完。   
        {  
            if(ans[p]+(a[i]-'0')+(b[j]-'0')>9)   //大于9，进位。   
            {  
                ans[p]=(ans[p]+(a[i]-'0')+(b[j]-'0'))%10;  
                ans[p+1]++;  
            }  
            else  
            {  
                ans[p]=ans[p]+(a[i]-'0')+(b[j]-'0');  
            }  
            i--;j--;p++;  
        }  
      
        if(i>=0) //当a有剩余时就单独和a做运算。   
        {  
            while(i>=0)  
            {  
                if(ans[p]+(a[i]-'0')>9)  
                {  
                    ans[p]=(ans[p]+(a[i]-'0'))%10;  
                    ans[p+1]++;  
                }  
                else  
                {  
                    ans[p]=ans[p]+(a[i]-'0');  
                }  
                i--;p++;  
            }  
        }  
        else if(j>=0)  
        {  
            while(j>=0)  
            {  
                if(ans[p]+(b[j]-'0')>9)  
                {  
                    ans[p]=(ans[p]+(b[j]-'0'))%10;  
                    ans[p+1]++;  
                }  
                else  
                {  
                    ans[p]=ans[p]+(b[j]-'0');  
                }  
                j--;p++;  
            }  
        }   
        flag=0;  
        printf("Case %d:\n",index); index++;  
        printf("%s + %s = ",a,b);  
        for(int i=p;i>=0;i--)  
        {  
            if(ans[i]==0 && flag==0)//加标记位，防止过多的前缀0   
                continue;  
            else  
            {  
                flag=1;  
                printf("%d",ans[i]);  
            }  
        }  
        printf("\n");  
        if(t)  
            printf("\n");  
    }  
    return 0;  
}  

C++:

#include <iostream> 
#include <string> 
using namespace std; 

void Add(string a,string b,char sum[],int& count) 
{//大数加法
    int len1 = a.length();//数a的长度
    int len2 = b.length();//数b的长度
    int i = len1-1,j = len2-1,temp = 0,carryIn = 0;//初始进位为
    count = 0; 
    //从最后一位开始做加法
    while(i>=0&&j>=0) 
    { 
        temp = a[i]-'0'+b[j]-'0'+carryIn;//计算当前位
        sum[count++] = temp%10+'0'; 
        carryIn = temp/10;//计算进位
        --i; 
        --j; 
    } 
    //第一个数还有剩余
    if(i>=0) 
    { 
        //利用进位继续做
        while(i>=0) 
        { 
            temp = a[i]-'0'+carryIn; 
            sum[count++] = temp%10+'0'; 
            carryIn = temp/10; 
            --i; 
        } 
    } 
    //第二个数还有剩余
    if(j>=0) 
    { 
        while(j>=0) 
        { 
            temp = b[j]-'0'+carryIn; 
            sum[count++] = temp%10+'0'; 
            carryIn = temp/10; 
            --j; 
        } 
    } 
    //最高位特殊考虑下
    if(carryIn>0) 
    { 
        sum[count++] = '1'; 
    } 
} 

void reversePrint(char arr[],int len) 
{//逆向输出
    for(int i=len-1;i>=0;--i) 
    {
        cout<<arr[i]; 
    }
    cout<<endl; 
} 

int main() 
{ 
    string a,b; 
    char sum[2000];//和
    memset(sum,'0',2000); 
    int nCount = 0; 
    int caseNum,curCase=0; 
    cin>>caseNum; 
    do 
    { 
        curCase++; 
        cin>>a>>b; 
        Add(a,b,sum,nCount); 
        cout<<"Case "<<curCase<<":"<<endl; 
        cout<<a<<" + "<<b<<" = "; 
        reversePrint(sum,nCount); 
        if(curCase<caseNum) 
        {
            cout<<endl; 
        }
    }while(curCase<caseNum); 
    return 0; 
} 

Java:

import java.math.BigInteger;   
import java.util.Scanner;   
  
class Main {   
    public static void main(String[] args) {   
        Scanner cin = new Scanner(System.in);   
        int n;   
        BigInteger a, b;   
  
        n = cin.nextInt();   
        for (int i = 0; i < n; i++) {   
            if (i > 0) {   
                System.out.println();   
            }   
            a = cin.nextBigInteger();   
            b = cin.nextBigInteger();   
            System.out.println("Case " + (i + 1) + ":");   
            System.out.println("" + a + " + " + b + " = " + a.add(b));   
        }   
    }   
}