jlab1101a.java

计算机系学习java的专用ppt

import java.io.*;
  public class JLab1101A{
     public static void main(String atgs[])throws IOException{
       float i,j,r=0;
       String s;
       char ch;
       BufferedReader din=new
              BufferedReader(new InputStreamReader(System.in));
       System.out.print("input i:");
       i=Float.parseFloat(din.readLine());
       System.out.print("input op:");
       s=din.readLine();
       ch=s.charAt(0);
       System.out.print("input j:");
       j=Float.parseFloat(din.readLine());
       switch(ch){
            case '+':r=i+j;break;
            case '-':r=i-j;break;
            case '*':r=i*j;break;
            case '/':r=i/j;break;
            default:break;
            }
       System.out.println(i+s+j+"="+r);
       }
     }