Chapter 2: Problem 12

Write a complete \(\mathrm{C}++\) program that reads in two whole numbers and outputs their sum. Be sure to prompt for input, echo input, and label all output.

Short Answer

Expert verified

Question: Write a C++ program that reads in two whole numbers and outputs their sum. Answer: The C++ program below reads two whole numbers and outputs their sum: ```cpp #include using namespace std; int main() { cout << "Please enter the first whole number: "; int num1; cin >> num1; cout << "Please enter the second whole number: "; int num2; cin >> num2; int sum = num1 + num2; cout << "You entered the numbers " << num1 << " and " << num2 << "." << endl; cout << "The sum of these numbers is: " << sum << endl; return 0; } ```

Step by step solution

Including necessary libraries

We need to include the iostream library in the program for input and output operation. ```cpp #include ```

Using the standard namespace

To avoid writing 'std::' before every cin and cout statement, we'll use the 'std' namespace. ```cpp using namespace std; ```

Writing the main function

The main function is the starting point of our program. ```cpp int main() { // Code will be placed here return 0; } ```

Prompting for input

Prompt the user to enter the first and second whole numbers. ```cpp cout << "Please enter the first whole number: "; cout << "Please enter the second whole number: "; ```

Reading the input values

Declare two integer variables 'num1' and 'num2' and use 'cin' to read the input. ```cpp int num1, num2; cin >> num1; cin >> num2; ```

Calculating the sum

Declare another integer variable 'sum' and store the result of addition for 'num1' and 'num2' into 'sum'. ```cpp int sum = num1 + num2; ```

Echoing the input values

Output the entered values before displaying the result. ```cpp cout << "You entered the numbers " << num1 << " and " << num2 << "." << endl; ```

Outputting the final result

Output the sum of the two input numbers. ```cpp cout << "The sum of these numbers is: " << sum << endl; ``` Combining all the above steps, the final C++ program would be: ```cpp #include using namespace std; int main() { cout << "Please enter the first whole number: "; int num1; cin >> num1; cout << "Please enter the second whole number: "; int num2; cin >> num2; int sum = num1 + num2; cout << "You entered the numbers " << num1 << " and " << num2 << "." << endl; cout << "The sum of these numbers is: " << sum << endl; return 0; } ```

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Write a complete \(\mathrm{C}++\) program that reads in two whole numbers and outputs their sum. Be sure to prompt for input, echo input, and label all output.

Short Answer

Step by step solution

Including necessary libraries

Using the standard namespace

Writing the main function

Prompting for input

Reading the input values

Calculating the sum

Echoing the input values

Outputting the final result

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