mysecond.java

用java语言实现的四则运算

package tr2;

public class Mysecond {
	float op1;
	float op2;
	char opr;
	float result;
	public void calculate(){
		switch (this.opr)
		{
		case'+':
		{this.result=this.op1+this.op2;
		break;
		}
		case'-':
		{this.result=this.op1-this.op2;
		break;
		}
		case'*':
		{
			this.result=this.op1*this.op2;
			break;
		}
		case'/':
		{
			if(this.op2==0)
				System.out.println("error");
				else
					this.result=this.op1/this.op2;
		}
		}
	}
    public  static void main(String args[])
    {
    	Mysecond p=new Mysecond();
    	p.op1=12;
    	p.op2=13;
    	p.opr='*';
    	p.calculate();
    	System.out.println(p.result);
    }
}