java第七次作业

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。

package home;




public class zuoye {

    /**
     * @param args
     */
    public static void main(String[] args) {
        int []a={10,20,30,40,50};
           for (int i : a) {
            System.out.println(i);
        }
    }

    }
    

 

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

 

package home;

import java.util.Scanner;

public class jiatingzuoye {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int []a=new int[5];
          Scanner input=new Scanner(System.in);
          for (int i = 0; i < a.length; i++) {
            a[i]=input.nextInt();
            
        }
        for (int i : a) {
            System.out.println(i);
        }
    }

}

 

 

 

 3.定义字符型数组，分别存储c、h、 i、n、a 并在控制台输出

 

package home;


public class jiatingzuoye {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        char[] a = { 'c', 'h', 'i', 'n', 'a' };
        for (char c : a) {
            System.out.println(c);
        }
    }

}

 

 

 

 4.输入5个学生成绩，求总分和平均分

 

 

package home;

import java.util.Scanner;


public class jiatingzuoye {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int pingju;
        int sum = 0;
        int[] a = new int[5];
        Scanner input = new Scanner(System.in);
        for (int i = 0; i < a.length; i++) {
            a[i] = input.nextInt();
            sum += a[i];

        }
        pingju = sum / 5;
        System.out.println("总和是" + sum);
        System.out.println("平均是" + pingju);
    }

}

 

 

 5.定义数组{12,53,23,44,53} 用for和foreach分别输出，再倒序输出

package home;


public class jiatingzuoye {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int []a={12,53,53,44,53};
         System.out.println("for输出");
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
        System.out.println("foreach输出");
        for (int i : a) {
             System.out.println(i);
        }
        System.out.println("倒序输出");
        for (int i = 4; i >=0; i--) {
            System.out.println(a[i]);
            
        }
    }

}

 

 

 6.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

package home;


public class jiatingzuoye {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         int []a={1,2,3,4,5};
          int jsgs=0;
          int osgs=0;
          for (int i = 0; i < a.length; i++) {
            if (a[i]%2==0) {
                osgs+=1;
                
            }else
                jsgs+=1;
        }
          System.out.println("奇数个数"+jsgs);
          System.out.println("偶数个数"+osgs);
    }

}

 

 

 7.生成一个100长度数组，里面的数分别是1-100，并输出

 

package home;


public class jiatingzuoye {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] a = new int[100];
        for (int i = 0; i < a.length; i++) {

            a[i] = i + 1;
            
        }
        for (int i : a) {
            if (i%10==0&&i!=100) {
                System.out.print("\n");
                continue;
            }
            System.out.print(i+"\t");
        }
    
        }

}

 

 

 

 

 

 

8.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。

package home;


public class jiatingzuoye {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double []a={80,40,60,90,95,98,65,48,65,};
        for (int i = 0; i < a.length; i++) {
            a[i]=a[i]+5;
            if (a[i]>100) {
                a[i]=100;
            }
            System.out.println(a[i]);
        }
    }

}