HUD-1000

---

title: HDU-1000
categories:

• ACM
• 水题
  tags:
• EOF
• C++文件代替手工输入
  date: 2020-02-05 09:17:01

---

C语言中EOF，C++中EOF，用input.txt代替手工输入，提高解题的测试速度

• 题目

  ---

  A + B Problem

  Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
  Total Submission(s): 944642 Accepted Submission(s): 281848

  Problem Description

  Calculate A + B.

  Input

  Each line will contain two integers A and B. Process to end of file.

  Output

  For each case, output A + B in one line.

  Sample Input

  1 1
  

  Sample Output

  2
  

---

1. C语言EOF

   while(scanf("%d%d",&a,&b)!=EOF)
   

2. C++EOF

   while(cin>>a>>b){
   

3. 用input.txt代替手工输入

   1. 在源程序文件(.c、.cpp)的同级目录新建intut.txt文件，里面模拟手工输入的数据

   2. 在源程序中main()函数开始处添加代码(要添加#include<stdio.h>头文件)，！！！提交代码前一定要注释掉这行代码

      #include<stdio.h>
      int main()
      {	
       	freopen("input.txt", "r", stdin);
      }
      

4. 本题AC代码：

   #include<iostream>
   #include<stdio.h>
   using namespace std;
   int main()
   {	
    	freopen("input.txt", "r", stdin);
   	int a,b;
   	while(cin>>a>>b){
   	cout<<a+b<<endl; 	
   	}
   }