C++ 代码
#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;
int main(){
double a,b,c;
cin>>a>>b>>c;
if(b*b-4*a*c<0||a==0) cout<<"Impossivel calcular";
else{
printf("R1 = %.5f\n",(-b+sqrt(b*b-4*a*c))/(2*a));
printf("R2 = %.5f",(-b-sqrt(b*b-4*a*c))/(2*a));}
return 0;
}