C Beginner

Valiantangel's Avatar, Join Date: Apr 2012
Light Poster
I am getting errors in the polynomial equation x.I hav no idea whats wrong.This equation was provided.My code is as followed


int main(void)
	double x;
	double polynomial=3x^3-5x^2+6;     /*This is giving me problem*/
	printf("The value of polynomial is %lf\n",polynomial);


DRK's Avatar
Go4Expert Member
1. Every programming language has its specific syntax. You cannot simply write mathematical expression, it is required to use some symbols called operators.
2. You have to assign value to x before you evaluate polynomial.
Chong's Avatar, Join Date: May 2011
Go4Expert Member
For MS Visual C++, the following will do:

#include <math.h> //or <math>

double x=2.55;
double polynomial = 3*pow(x,3)-5*pow(x,2)+6
crashcoder's Avatar, Join Date: Apr 2012
Newbie Member
instead of polynomial=3x^3-5x^2+6;
try using the "pow function" polynomial=3*pow(x,( 3))-5*pow(x,(2))+6;
You could declare x as const int x=?; above your polynomial variable;
logically it could work, but id google the pow function to make sure i wrote it right
its been a while since ive used it.
crashcoder's Avatar, Join Date: Apr 2012
Newbie Member
Oh and to use pow function you might need to include <cmath> library, we do in secure shell IDE