Implementing arithmetic and array functions

#include <stdio.h>


double add(double a, double b)
{
  return a+b;
}

double subtract(double a, double b)
{
  return a-b;
}

double multiply(double a, double b)
{
  return a*b;
}

double array_op(double array[], int size, double (*pfun)(double,double))
{
  double result = array[size-1];
  int i = 0;

  for(i = size-1 ; i>0 ; i--)
    result = pfun(array[i-1], result);
  return result;
}


int main()
{
  double array[] = {11.0, 10.0, 9.0, 8.0, 7.0, 6.0, 5.0, 4.0, 3.0, 2.0, 1.0};
  int i = 0;
  int length = sizeof array/sizeof(double);
  printf("The value of:\n");

  for(i = 0 ; i< length ; i++)
  {
    printf("%.2f%s\n", array[i]);
  }
  printf(" is %.2lf\n", array_op(array,length,add));

  printf("\nThe value of:\n");
  for(i = 0 ; i< length ; i++)
  {
    printf("%.2lf%s\n", array[i]);
  }
  printf(" is %.2lf\n", array_op(array, length, subtract));

  printf("\nThe value of:\n");
  for(i = 0 ; i< length ; i++)
  {
    printf("%.2lf%s\n", array[i]);
  }
  printf(" is %.2lf\n", array_op(array, length, multiply));
}

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4.	Function pointer
5.	Function pointer 2
6.	Function pointer: function call
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8.	Array of function pointer
9.	Initialize the function pointer array

Implementing arithmetic and array functions : Function Pointer « Function « C / ANSI-C

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