Newton_Raphson in C

// Newton Raphson Method C Program
// Credit: script verse academy

#include<stdio.h>
#include<math.h>

float f(float);
float derivative(float);

int main()
{
    float x; // x is first approximation

    unsigned short i=1,n; // n is the number of iteration

    printf("First APPROXIMATION: ");
    scanf("%f", &x);

    printf("ITERATIONS: ");
    scanf("%hu", &n);

    while(i<=n)
    {
        x = x - f(x)/derivative(x);
        i++;
    }

    printf("APPROXIMATE ROOT: %f \n",x);
    return 0;
}
float f(float x) // f(x)
{
    return pow(x,2)-5;
}
float derivative(float x) // f'(x)
{
    return 2*x;
}
/* Input
First APPROXIMATION: 2
ITERATIONS: 5
Output
APPROXIMATE ROOT: 2.236068
*/