C program for Newton Raphson method with output

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

//equation f(x)
float f(float x) {
  // change the equation for solving another problem
  return pow(x, 2) - 6;
}

//derivative of equation i.e f'(x)
float derivative(float x) {
  // write the derivative of your equation
  return 2 * x;
}

int main() {
  float x;
  int n, i;

  printf("Enter initial guess value: ");
  scanf("%f", &x);

  printf("Enter number of iterations: ");
  scanf("%d", &n);
  for (i = 1; i <= n; i++) 
  {
    if (derivative(x) == 0) {
      // f'(x) should not be 0
      printf("Division by Zero is not allowed.");
      exit(0);
    }

    //Newton Raphson formula
    x = x - f(x) / derivative(x);

    // fabs() method will return positive value
    printf("\nIteration %d and value %f", i, fabs(x));
  }

  printf("\n approximate root: %f \n", fabs(x));
  return 0;
}