#includeIn this example, we define a function named "multiply" that takes two integers as input, multiplies them, and returns the result. We then call this function in the main function and output the result to the console. Package/library: Standard Libraryint multiply(int x, int y) { return x * y; } int main() { int a = 4, b = 5; std::cout << multiply(a, b); // Output: 20 return 0; }