Pointer to Function

#include <iostream>
using namespace std;

// Function declarations
int add(int a, int b) {
    return a + b;
}

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

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

int divide(int a, int b) {
    if (b != 0) {
        return a / b;
    }
    return 0;
}

int main() {
    // Declare function pointer
    int (*operation)(int, int);
    
    int num1 = 20, num2 = 5;
    
    // Point to add function
    operation = add;
    cout << num1 << " + " << num2 << " = " << operation(num1, num2) << endl;
    
    // Point to subtract function
    operation = subtract;
    cout << num1 << " - " << num2 << " = " << operation(num1, num2) << endl;
    
    // Point to multiply function
    operation = multiply;
    cout << num1 << " * " << num2 << " = " << operation(num1, num2) << endl;
    
    // Point to divide function
    operation = divide;
    cout << num1 << " / " << num2 << " = " << operation(num1, num2) << endl;
    
    // Array of function pointers
    int (*operations[])(int, int) = {add, subtract, multiply, divide};
    char opSymbols[] = {'+', '-', '*', '/'};
    
    cout << "\nUsing array of function pointers:" << endl;
    for (int i = 0; i < 4; i++) {
        cout << num1 << " " << opSymbols[i] << " " << num2 
             << " = " << operations[i](num1, num2) << endl;
    }
    
    return 0;
}