Initialize the function pointer array

#include <stdio.h>

int sum(int a, int b);
int subtract(int a, int b);
int mul(int a, int b);
int div(int a, int b);

/* initialize the pointer array */
int (*p[4]) (int x, int y) = {
  sum, subtract, mul, div
} ;

int main(void)
{
  int result;
  int i = 2, j = 2, op;

  
  printf("0: Add, 1: Subtract, 2: Multiply, 3: Divide\n");
  do {
    printf("Enter number of operation: ");
    scanf("%d", &op);
  } while(op<0 || op>3);

  result = (*p[op]) (i, j);
  printf("%d", result);

  return 0;
}

int sum(int a, int b)
{
  return a + b;
}

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

int mul(int a, int b)
{
  return a * b;
}

int div(int a, int b)
{
  if(b) 
      return a / b;
  else 
      return 0;
}

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4.	Passing a Pointer to a function
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7.	Function pointer: function call
8.	Function pointer and use it call a function
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Initialize the function pointer array : Function Pointer « Function « C / ANSI-C

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