JAVA第七周作业0416

package com.homework7;
//1.编写一个简单程序，要求数组长度为5，
//静态赋值10，20，30，40，50，在控制台输出该数组的值。
public class Exe7_1_1 {
    public static void main(String[] args) {
        int m[] = {10,20,30,40,50};
        for (int i : m) {
            System.out.println(i);
        }
    }
}

 

 

 

package com.homework7;
//2.编写一个简单程序，要求数组长度为5，动态赋值，并在控制台输出该数组的值。
import java.util.Scanner;

public class Exe7_1_2 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int []m = new int[5];
        System.out.println("请输入5个数");
        for (int i = 0; i < m.length; i++) {
            m[i] = input.nextInt();
        }
        for (int i = 0; i < m.length; i++) {
            System.out.println(m[i]);
        }
    }
}

 

 

package com.homework7;
//3.定义字符型数组，分别存储c、h、 i、n、a 并在控制台输出
public class Exe7_1_3 {
    public static void main(String[] args) {
        char m[] = {'c','h','i','n','a'};
        for (char c : m) {
            System.out.print(c + "\t");
        }
    }
    
}

 

 

package com.homework7;
//4.输入5个学生成绩，求总分和平均分
import java.util.Scanner;

public class Exe7_1_4 {
    public static void main(String[] args) {
        Scanner input =new Scanner(System.in);
        double sum = 0;
        double []m =new double[5];
        for (int i = 0; i < m.length; ) {
            System.out.print("请输入第"+(i+1)+"个学生成绩:");
            m[i] =input.nextDouble();
            if(0>m[i] || m[i]>100){
                System.out.println("输入不合法，请重新输入!");
                continue;
            }else{
                sum += m[i];
                i++;
            }
        }
        System.out.println("总分是:"+sum);
        System.out.println("平均分是:"+sum/5);
    }
}

 

 

package com.homework7;
//5.定义数组{12,53,23,44,53} 用for和foreach分别输出，再倒序输出
public class Exe7_1_5 {
    public static void main(String[] args) {
        int m[] ={12,53,23,44,53};
        System.out.print("for输出:\t");
        for (int i = 0; i < m.length; i++) {
            System.out.print(m[i] + "\t");
        }
        System.out.println();
        System.out.print("foreach输出:");
        for (int i : m) {
            System.out.print(i + "\t");
        }
        System.out.println();
        System.out.print("倒序输出:\t");
        for (int i = m.length-1; i >=0 ; i--) {
            System.out.print(m[i] + "\t");
        }
    }
}

 

 

package com.homework7;
//1.定义一个整型数组，赋值(动态静态都可以)后求出奇数个数和偶数个数
import java.util.Scanner;

public class Exe7_2_1 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int jisum =0;
        int ousum =0;
        int []m = new int[10];
        System.out.println("请输入10个整数,判断奇偶个数:");
        for (int i = 0; i < m.length; i++) {
            
            m[i] = input.nextInt();
            if (m[i] == 0) {
                
            } else if(m[i] %2==0) {
                ousum ++;
            }else{
                jisum ++;
            }
        }
        System.out.println("奇数有" + jisum + "个!");
        System.out.println("偶数有" + ousum + "个!");
    }
}

 

 

package com.homework7;
//2.生成一个100长度数组，里面的数分别是1-100，并输出
public class Exe7_2_2 {
    public static void main(String[] args) {
        int []m =new int[100];
        for (int i = 0; i < 100; i++) {
            m[i] =i+1;
        }
        for (int i : m) {
            System.out.print(i +"  ");
            if(i%10==0)
                System.out.println();
        }
    }
}

 

 

package com.homework7;
//3.定义一个double数组，存放10个学生的成绩，给所有同学加5分，不能超过100分。
import java.util.Scanner;

public class Exe7_2_3 {
    public static void main(String[] args) {
        Scanner input =new Scanner(System.in);
        double []m =new double[10];
        for (int i = 0; i < m.length; ) {
            System.out.print("请输入第"+(i+1)+"个学生成绩:");
            m[i] =input.nextDouble();
            if(0>m[i] || m[i]>100){
                System.out.println("输入不合法，请重新输入!");
                continue;
            }
            m[i] +=5;
            if(m[i]>100)
                m[i]=100;
            i++;
        }
        for (double d : m) {
            System.out.println(d);
        }
    }
}