C function pointers

funcPointers.c

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

#define safeFree(p) saferFree((void**)&(p))
void saferFree(void **pp) {
  if (pp != NULL && *pp != NULL) {
    free(*pp);
    *pp = NULL;
  }
}

typedef int (*fptrOperation)(int,int);
typedef int (*operation)(int,int);
operation operations[128] = {NULL};

int add(int num1, int num2){
  return num1 + num2;
}

int sub(int num1, int num2){
  return num1 - num2;
}

int multi(int num1, int num2){
  return num1*num2;
}

int square(int num1){
  return num1*num1;
}

void initializeOperationsArray() {
  operations['+'] = add;
  operations['-'] = sub;
  operations['*'] = multi;
  operations['^'] = (fptrOperation)square;
}

int evaluateArray(char opcode, int num1, int num2){
  fptrOperation op;
  op = operations[(int)opcode];
  return op(num1, num2);
}

int main(int argc, char **argv) {

 // while(argc--)
 //    printf("%s\n", *argv++);

  // the first 128 ASCII characters
  initializeOperationsArray();

  printf("%d\n", evaluateArray('+', 5, 6));
  printf("%d\n", evaluateArray('-', 5, 6));
  printf("%d\n", evaluateArray('*', 5, 6));
  printf("%d\n", evaluateArray('^', 5, 0));

  return (EXIT_SUCCESS);
}

main.c

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

typedef int (*fptrOperation)(int,int);
typedef int (*operation)(int,int);
operation operations[128] = {NULL};

int add(int num1, int num2){
  return num1 + num2;
}

int sub(int num1, int num2){
  return num1 - num2;
}

int multi(int num1, int num2){
  return num1*num2;
}

int square(int num1){
  return num1*num1;
}

void initializeOperationsArray() {
  operations['+'] = add;
  operations['-'] = sub;
  operations['*'] = multi;
  operations['^'] = (fptrOperation)square;
}

int evaluateArray(char opcode, int num1, int num2){
  fptrOperation op;
  op = operations[(int)opcode];
  return op(num1, num2);
}

int main(int argc, char **argv) {
  // the first 128 ASCII characters
  initializeOperationsArray();

  printf("%d\n", evaluateArray('+', 5, 6));
  printf("%d\n", evaluateArray('-', 5, 6));
  printf("%d\n", evaluateArray('*', 5, 6));
  printf("%d\n", evaluateArray('^', 5, 0));

  return (EXIT_SUCCESS);
}