#include<stdio.h>
#include<math.h>
float x1,x2,disc,p,q;
int main()
{
void greater_than_zero(float,float);
void equal_to_zero(float,float);
void smaller_than_zero(float,float);
float a,b,c;
printf("\ninput a,b,c:");
scanf("%f,%f,%f",&a,&b,&c);
printf("equation:%5.2f*x*x+%5.2f*x+%5.2f=0\n",a,b,c);
disc=b*b-4*a*c;
printf("root:\n");
if(disc>0)
{
greater_than_zero(a,b);
printf("x1=%f\t\tx2=%f\n",x1,x2);
}
else if(disc==0)
{
equal_to_zero(a,b);
printf("x1=%f\t\tx2=%f\n",x1,x2);
}
else
{
smaller_than_zero(a,b);
printf("x1=%f+%fi\tx2=%f-%fi\n",p,q,p,q);
}
system("pause");
}
void greater_than_zero(float a,float b)
{
x1=(-b+sqrt(disc))/(2*a);
x2=(-b-sqrt(disc))/(2*a);
}
void equal_to_zero(float a,float b)
{
x1=x2=(-b)/(2*a);
}
void smaller_than_zero(float a,float b)
{
p=-b/(2*a);
q=sqrt(-disc)/(2*a);
}
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
int flag=0; // ......
