代码如下： 

#include<iostream>
#include<cmath>
using namespace std;
int main(){
	cout<<"请输入a,b,c:";
	int a,b,c,dat;
	cin>>a>>b>>c;
	dat=pow(b,2)-4*a*c;
	if(dat<0){
		cout<<"该方程没有实数根"; 
	}else if(dat==0){
		cout<<"该方程的实数根是:"<<(b-2*b+sqrt(dat))/4*a;
	}else{
		cout<<"该方程的实数根是:"<<"x1="<<((b-2*b+sqrt(dat))/4*a)*2<<endl;
		cout<<"x2="<<((b+sqrt(dat))/4*a)*2;
	}
	return 0;
	}