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开发一个用于四则运算的类

//Operator.h#ifndef _OPERATOR_H#define _OPERATOR_Hclass Operator{   private:	char m0p;	double mp1;	double mp2;public:	bool setOperator(char op);	void setParameter(double p1,double p2);	bool result(double& r);};#endif

//Operator.c#include"Operator.h"bool Operator::setOperator(char op){   	bool ret = flase;	if(op == '+' || op == '-' || op == '*' || op == '/')	{   		ret = true;		m0p = op;	}	else	{   		m0p = '\0';	}	return ret;}void Operator::setParameter(double p1,double p2){   	mp1 = p1;	mp2 = p2;}bool Operator::result(double& r){   	bool ret = true;	switch(m0p)	{   		case '/':			if(-0.000000001

//main.c#include
   
    #include"Operator.h"int main(){   	Operator op;	double r = 0;	op.setOperator('/');	op.setParameter(9,3);		if(op.result(r))	{   		printf("r = %lf\n",r);	}	else	{   		printf("Calculate error!\n");	}	return 0;}
   

输出结果为3.000000