下午作业做的一个小程序:
package work09_20;
import java.io.IOException;
import java.util.Scanner;
/*11*/
public class Test08 {
public static void main(String[] args) throws IOException {
js:
while(true){
Scanner scan = new Scanner(System.in);
System.out.println("请选择操作 1-计算 2-退出:");
String s = scan.next();
int x = Integer.parseInt(s);
switch (x) {
case 1:
scan = new Scanner(System.in);
System.out.println("输入操作数1:");
String s1 = scan.next();
double m1 = Double.parseDouble(s1);
System.out.println("输入运算符 + - * /:");
String s2 = scan.next();
char m2 = s2.charAt(0);
System.out.println("输入操作数2:");
String s3 = scan.next();
double m3 = Double.parseDouble(s3);
System.out.println("计算结果为:");
System.out.print(m1 + "" + m2 + "" + m3 + "=");
if (m2 == '+') {
System.out.println(m1 + m3);
continue js;
} else if (m2 == '-') {
System.out.println(m1 - m3);
continue js;
} else if (m2 == '*') {
System.out.println(m1 * m3);
continue js;
} else if (m2 == '/') {
System.out.println(m1 / m3);
continue js;
}
case 2:
System.exit(1);
}
}
}
}