Program in C to calculate the sum

Write a C program to calculate the following Sum: 
Sum=1- X^2/2! + X^4/4! - X^6/6! + X^8/8! - X^10/10!

#include <stdio.h>

#include <math.h>

#include <conio.h>

void main()

{

            int counter,f_coun;

            float sum=0,x,power,fact;

            clrscr();

            printf("<-----------------------PROGRAM FOR SUM OF EQ. SERIES----------------------->");

            printf("\n\n\tEQUATION SERIES : 1- X^2/2! + X^4/4! - X^6/6! + X^8/8! - X^10/10!");

            printf("\n\n\n\tENTER VALUE OF X : ");

            scanf("%f",&x);

            for(counter=0, power=0; power<=10; counter++,power=power+2)

            {

                        fact=1;

                        //CALC FACTORIAL OF POWER VALUE

                        for(f_coun=power; f_coun>=1; f_coun--)

                                    fact *= f_coun;

                        //EQ. FOR SUM SERIES

                        sum=sum+(pow(-1,counter)*(pow(x,power)/fact));

            }

            printf("SUM : %f",sum);

            getch();

}