a006. 一元二次方程式 | From: [220.142.70.87] | 發表日期 : 2018-05-27 10:58

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main()
{
int a,b,c,x1,x2;
while(scanf("%d %d %d",&a,&b,&c)!=EOF)
 {
  if((b*b-4*a*c)>0)
  {
    x1=(-b+sqrt(b*b-4*a*c))/(2*a);
    x2=(-b-sqrt(b*b-4*a*c))/(2*a);
    if(x1>x2)
     {
       printf("Two different roots x1=%d , x2=%d\n",x1,x2);
       }
    else
      {
       printf("Two different roots x1=%d , x2=%d\n",x2,x1);
       }
  }
  else if((b*b-4*a*c)==0)
  {
  x1=(-b+sqrt(b*b-4*a*c))/(2*a);
  printf("Two same roots x=%d\n",x1);
  }
  else if((b*b-4*a*c)<0)
  {
  printf("No real root\n");
  }
  }
  return 0;
}