Help with conditional statements on C programming

[10ali01]

I am a beginner on C programming and an error message (underlined) that I have typed on the below program is not working....can anyone help please???
I am solving a quadratic equation the -b +/- root(b*b-4ac)/2a. If b*b is less than 4ac then there are no real roots so I need an error message. So i have made the bracket (f) and said that if it is less than zero the error message should come up....but its not! Any help would be grateful!!!



#include <stdio.h>
#include <math.h>
int main() {
   float a, b ,c, d, e, f, root, x1,x2, b2;
   printf("Enter a:  ");
   scanf("%f",&a);
   printf("Enter b:  ");
   scanf("%f",&b);
   printf("Enter c:  ");
   scanf("%f",&c);
   b2 = pow(b,2);
   d = (4*a*c);
   f = (b2-d);

   if(f<0) {
      printf("Error - no real roots!\n"); /*Error messaging*/
      return 0;
   }
   root = sqrt(f);
   e = root/(2*a);
   x1 = ((-b)+e);
   x2 = ((-b)-e);
   printf("Solution=%f\n",x1);
   printf("Solution=%f\n",x2);
   return 0;
}

[vishalsaxena17]

wel i understand your problem , the small thing that is missing in your code is
" #INCLUDE <MATH.H>  header file because of which you are unable to calculate..
1>. " sqrt "  function.

2>. " Pow "  function so are getting unexpected results..

i am pasting the correct code , just check it out

#include<stdio.h>
#include<conio.h>
#include<math.h>
int main()
{
float a,b,c,d,e,f,root,x1,x2,b2;
printf("enter a: ");
scanf("%f",&a);
printf("enter b :");
scanf("%f",&b);
printf("enter c: ");
scanf(" %f",&c);
b2=b*b;
d=(4*a*c);
f=(b2-d);
printf("the value of F is = %f",f);
if(f<0)
{
printf(" error - no real root") ;
return 0;
}

root = sqrt(f);
e=root/(2*a);
x1=((-b)+e);
x2=((-b)-e);
printf("solution =%f\n",x1);
printf("solution =%f\n",x2);
return 0;

}

[Sidewinder]

I know nothing about C. That said, I used the Tiny C Compiler and your code works just dandy.

Results:

C:\Temp\tcc>test
Enter a:  12
Enter b:  1
Enter c:  3
Error - no real roots!

C:\Temp\tcc>test
Enter a:  1
Enter b:  5
Enter c:  2
Solution=-2.938447
Solution=-7.061553

Seems fine to me.

PS. You did too include the math header file.