第二次上机课作业

作业1.编写一个程序,定义圆的半径,求圆的面积.
package work_oc;

import java.util.Scanner;
public class work_1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("请输入圆的半径(r>0)");
        Scanner si=new Scanner(System.in);
        float r=si.nextFloat()
        float s;
        s=r*r*3.14F;
        System.out.println("该圆的半径为:"+s);
    }

}

作业2.华氏温度和摄氏温度互相转换
package work_oc;

public class work_2 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double hua=50;
        hua=(hua-32)*5/9;
        double she=30;
        she=she*9/5+32;
        System.out.println("50度华氏温度转化为摄氏度的结果为:"+hua);
        System.out.println("30度摄氏温度转化为华氏度的结果为:"+she);
    }
}

作业3.:变量和运算符综合应用
package work_oc;

public class work_3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a=5;
        int b=8;
        int c;
        System.out.println("交换前a,b的值分别为"+a+"和"+b);
        c=a;
        a=b;
        b=c;
        System.out.println("交换后a,b的值分别为"+a+"和"+b);
    }

}


作业4.变量和运算符综合应用
package work_oc;

public class work_4 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int n=12141;
        System.out.println("五位数为:"+n);
        int a;
        a=n-(n%100);
        System.out.println("保留至百位后:"+a);
    }

}


作业5.变量和运算符综合应用
package work_oc;

public class work_5 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a=1234;
        System.out.println("其各位数总和为\n");
        int b,c,d,e;
        b=a/1000;
        e=a%10;
        c=a/100-b*10;
        d=(a%100-e)/10;
        System.out.println(b+c+d+e);
    }

}


作业6.变量和运算符综合应用
package work_oc;

public class work_6 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int field='A';
        System.out.println("其小写为");
        field=field+32;
        System.out.println((char)field);
    }

}


posted @ 2021-03-14 18:10  计算机1903孙铭泽  阅读(50)  评论(0编辑  收藏  举报