1   // Fig. 2.5: fig02_05.cpp
 2   // Addition program that displays the sum of two integers.
 3   #include <iostream> // allows program to perform input and output
 4
 5   // function main begins program execution
 6   int main()
 7   {
 8      // variable declarations
 9      int number1 = 0; // first integer to add (initialized to 0)  
10      int number2 = 0; // second integer to add (initialized to 0) 
11      int sum = 0; // sum of number1 and number2 (initialized to 0)
12
13      std::cout << "Enter first integer: "; // prompt user for data
14      std::cin >> number1; // read first integer from user into number1
15
16      std::cout << "Enter second integer: "; // prompt user for data
17      std::cin >> number2; // read second integer from user into number2
18
19      sum = number1 + number2; // add the numbers; store result in sum
20
21      std::cout << "Sum is " << sum << std::endl; // display sum; end line
22   } // end function main