/*使用java类描述一个计算机类
 *
 */

class Calculator
{
 private int num1;
 private int num2;
 private char option;
 
 
 //
 public void initCalculator(int n1, int n2, char o){
  num1 = n1;
  num2 = n2;
  if(o == '*' || o == '-' || o == '/' || 0 == '+')
  {
   option = o;
  }
  else{
   option = '+';
  }
 }
 
 
 public void calculate()  // 运算
 {
  switch(option){
  case '+':
   System.out.println("做加法运算,结果是" + (num1+num2));
   break;
  case '-':
   System.out.println("做减法运算,结果是" + (num1-num2));
   break;
  case '*':
   System.out.println("做乘法运算,结果是" + (num1*num2));
   break;
  case '/':
   System.out.println("做除法运算,结果是" + (num1/num2));
   break;
   

  }
 }
 
}

class Demo20
{
 public static void main(String[] args)
 {
  Calculator c = new Calculator();
  
  c.initCalculator(1,2,'+');
  
  c.calculate();
 }
}