Answer Posted / asif ahmed

/* PROGRAM TO FIND THE ROOTS OF A QUADRATIC EQUATION WITH
APPROPRIATE ERROR MESSAGE */

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
float a,b,c,disc,root1,root2,part_r,part_i;
int flag;
clrscr();
printf("Enter the coefficients of quadratic equation \n");
scanf("%f%f%f",&a,&b,&c);
printf("coefficients are a=%f\t b=%f\t c=%f\n",a,b,c);
if((a==0)||(b==0)||(c==0))
printf("\nZero coefficeints");
else
{
disc=(b*b)-(4*a*c);
if(disc==0)
flag=0;
if(disc>0)
flag=1;
if(disc<0)
flag=2;
switch(flag)
{
case0 : printf("\n Roots are real and equal");
root1=-(-b)/(2*a);
root2=root1;
printf("\n root1=%f",root1);
printf("\n root2=%f",root2);
break;
case1 : printf("\n Roots are real and distinct");
root1=(-b+sqrt(disc))/(2*a);
root2=(-b-sqrt(disc))/(2*a);
printf("\n root1=%f",root1);
printf("\n root2=%f",root2);
break;
case2 : printf("\n Roots are real and Imaginary");
part_r=(-b)/(2*a);
part_i=(sqrt(-disc))/(2.0*a);
printf("\n root1=%f +i%f",part_r,part_i);
printf("\n root2=%f -i%f",part_r,part_i);
break;
}
}
getch();
}

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