【JAVA】循环语句

1. 偶数

public class Main{
    public static void main(String[] args){
        for(int i = 2; i <= 100; i += 2) {
            System.out.println(i);
        }
    }
}

2. 奇数

import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        
        for(int i = 1; i <= x; i += 2) {
            System.out.println(i);
        }
    }
}

3. 正数

import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int cnt = 0;
        for(int i = 1; i <= 6; i += 1) {
            double x = sc.nextDouble();
            if(x > 0) {
                cnt += 1;
            }
        }
        System.out.printf("%d positive numbers\n", cnt);
    }
}

4. 连续奇数的和1

import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int y = sc.nextInt();
        int cnt = 0;
        if(x > y) {
            int tmp = x;
            x = y;
            y = tmp;
        }
        for(int i = x + 1; i < y; i += 1) {
            // System.out.printf("%d\n", i % 2);
            if(i % 2 != 0) {
                cnt += i;
            }
        }
        System.out.printf("%d\n", cnt);
    }
}

5. 最大数和它的位置

import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int cnt = 0;
        int idx = 0;
        for(int i = 1; i <= 100; i += 1) {
            int x = sc.nextInt();
            if(x > cnt) {
                cnt = x;
                idx = i;
            }
        }
        System.out.println(cnt);
        System.out.println(idx);
        
    }
}

6. 递增序列

import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(true) {
            int x = sc.nextInt();
            if(x == 0) break;
            for(int i = 1; i <= x; i += 1) {
                System.out.printf("%d ", i);
            }
            System.out.printf("\n");

        }
    }
}