A programm to find f(x)=x-x^3+x^5-x^7

//A programm to find f(x)=x-x^3+x^5-x^7

#include<stdio.h>
#include<conio.h>
#include<math.h>
int factorial (int j)
{
int i,fac=1;
if(j==0)
{
return 1;
}
else
{
for(i=1;i<=j;i++)
{
fac=fac*1;
}
}
return fac;

}
int main()
{
int i,y,fac;
float x,k,result=0;
clrscr();
y=2;
printf("Enter the value of f(x)\n");
scanf("%f",&x);
for(i=0;i<=6;i=i+2)
{
k=pow(x,i);
fac=factorial(i);
result=result+pow(-1,y)*(k/fac);
y=y+1;
}
printf("The value of f(x):%f",result);
getch();
return 0;
}