Write a C program to calculate the following Sum: Sum=1-x2/2! +x4/4!-x6/6!+x8/8!-x10/10!

/* Write a C program to calculate the following Sum:
 Sum=1-x2/2! +x4/4!-x6/6!+x8/8!-x10/10!
*/

#include <stdio.h>
#include <math.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\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();

}
/*
Output:
PROGRAM FOR SUM OF EQ. SERIES

 EQUATION SERIES : 1- X^2/2! + X^4/4! - X^6/6! + X^8/8! - X^10/10!
 ENTER VALUE OF X : 4
SUM : -0.685785

*/