第一次上机作业

第三题 华氏度50转成摄氏度是多少
package chem;

public class vhj {

    public static void main(String[] args) {
        int C; 
        int F = 50;
        C = (F - 32)*5/9;
        System.out.println(C);

    }

}

 

第二题

第四题
package chem;

public class vhj {

    public static void main(String[] args) {
        char a = 'A';

        System.out.println((char)(a + 32));
    }

}

package chem;

public class vhj {

    public static void main(String[] args) {
int  i = 1000;
int x1 = i / 1000;
int x2 = i / 100 % 10;
int x3 = i / 10 % 10;
int x4 = i % 10;
System.out.println(x1 + x2 + x3 + x4);

    }

}

　　

package chem; public class vhj { public static void main(String[] args) { int a=2,b=3,c; c=a; a=b; b=c; System.out.println("交换后的a="+ a + ",b=" + b); } }