#include <iostream.h>/*PrototypesKeep in mind that the prototypes only need to matchtheir types. Below, any of the following will work.*/int addTwoNumbers(int a, int b);//int addTwoNumbers(int num1, int num2);//int addTwoNumbers(int, int);int main(){ int number1; int number2; int sum; //cout is to output text to the console cout << "Please enter two numbers and I will tell you their sum!\n\n"; cout << "Enter Number1: "; //cin is used to accept input from the user cin >> number1; cout << "Enter Number2: "; cin >> number2; //Our functions returns the sum of the two nubmers the user typed in sum = addTwoNumbers(number1, number2); cout << "The sum of your two number is: " << sum; return 1;}int addTwoNumbers(int a, int b){ int sum; sum = a + b; return sum;}