// 选择结构和条件判断.cpp : Defines the entry point for the console application.
#include "stdafx.h"
#include <stdio.h>
#include <math.h>
int main()
{
float a,b,c,disc,x1,x2,p,q;
scanf("%f%f%f",&a,&b,&c);
disc=b*b-4*a*c;
if(disc<0)
printf("this equation hasn't real roots\n");
else
{
p=-b/(2.0*a);
q=sqrt(disc)/(2.0*a);
x1=p+q;x2=p-q;
printf("real roots:\nx1=%7.2f\nx2=%7.2f\n",x1,x2);
}
return 0;
}
ps:求一元二次方程根的c程序代码!