关于A+B问题

[A+B Problem]（单组数据输入）(http://acm.sdut.edu.cn/onlinejudge2/index.php/Home/Contest/contestproblem/cid/2575/pid/1000)

import java.util.Scanner;
public class Main {
    public static void main(String args[]) {

    Scanner input=new Scanner(System.in);
    int a,b;
    a=input.nextInt();
    b=input.nextInt();
    System.out.println(a+b);
    input.close();//关闭输入的流，释放内存。
     }


}

A+B for Input-Output Practice (I)（多组数据输入）

import java.util.Scanner;
public class Main {
    public static void main(String args[]) {

    Scanner input=new Scanner(System.in);
    int a,b;
    while(input.hasNextInt()) {

      a=input.nextInt();
      b=input.nextInt();
      System.out.println(a+b);

      }

     }

}

A+B for Input-Output Practice (II)（固定组数输入）

import java.util.Scanner;

public class Main {
    public static void main(String args[]) {

        Scanner input = new Scanner(System.in);
        int a, b, n;
        n = input.nextInt();
        do {

            a = input.nextInt();
            b = input.nextInt();
            System.out.println(a + b);

        } while (--n > 0);

    }

}

A+B for Input-Output Practice (IV)（多组输入，如果输入第一个数为0，则结束）

import java.util.Scanner;

public class Main {
    public static void main(String args[]) {
        Scanner input = new Scanner(System.in);
        int a, b, i;
        while (input.hasNextInt()) {
            int sum = 0;
            int n = input.nextInt();
            if (n == 0)
                break;//******
            else {
                for (i = 1; i <= n; i++) {
                    a = input.nextInt();
                    sum += a;
                }

                System.out.println(sum);
            }

        }

    }

}