Illegal Use of pointer

[Abin Hasan]

#include<stdio.h>
 #include<conio.h>
 #include<math.h>
 #include<stdlib.h>
 void main ()
 {
  float a, b, c, d, x1, x2;
  clrscr();
  printf("Enter value for a b  & c\n");
  scanf("%f %f %f",&a,&b,&c);
  d=b*b-4*a*c;
  if(d<0)
  printf("Roots r imaginary");
  else
  {
  x1=(-b+sqrt*d)/(2*a);
  x2=(-b-sqrt*d)/(2*a);
  printf("x1=%.3f x2=%.3f",x1,x2);
  }
  getch();
 }

[rstiltskin]

Lines 16-17 should be:

  x1=(-b+sqrt(d))/(2*a);
  x2=(-b-sqrt(d))/(2*a);
 

because d is the argument that you are supplying to the sqrt function.

Also, in order to comply w ith the C language standard, the return value of your main function should be int, not void, i.e.:

int main ()