91Ó°ÊÓ

include #include using namespace std; const int PRIME_NUM = 11; int ma… # What is printed by the following program? Suppose the input is: Miller 34 340 #include #include using namespace std; const int PRIME_NUM = 11; int main() { const int SECRET = 17; string name; int id; int num; int mysteryNum; cout << "Enter last name: "; cin >> name; cout << endl; cout << "Enter a two digit number: "; cin >> num; cout << endl; id = 100 * num + SECRET; cout << "Enter a positive integer less than 1000: "; cin >> num; cout << endl; mysteryNum = num * PRIME_NUM - 3 * SECRET; cout << "Name: " << name << endl; cout << "Id: " << id << endl; cout << "Mystery number: " << mysteryNum << endl; return 0; }

Step by step solution

01

Determine the value of 'id'

The program first reads the name and then prompts for a two-digit number, which is assigned to 'num'. According to the problem, our input for 'num' is 34. The program calculates 'id' with the formula \( id = 100 \times num + SECRET \). With \( SECRET = 17 \), we have:\[id = 100 \times 34 + 17 = 3400 + 17 = 3417\]

02

Determine the value of 'mysteryNum'

Next, the program prompts for a positive integer less than 1000. Our input for 'num' at this step is 340. The program calculates 'mysteryNum' with:\[mysteryNum = num \times PRIME\_NUM - 3 \times SECRET\]With \( PRIME\_NUM = 11 \) and \( SECRET = 17 \), the computation becomes:\[mysteryNum = 340 \times 11 - 3 \times 17 = 3740 - 51 = 3689\]

03

Print the output

The program prints output based on previously computed values: - Name (variable 'name') is 'Miller'. - Id (variable 'id') is 3417. - Mystery Number (variable 'mysteryNum') is 3689. So, the output that will be printed is: ``` Name: Miller Id: 3417 Mystery number: 3689 ```

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Input/Output Streams

In C++ programming, input and output streams handle how a program interacts with the user through input devices like keyboards and output devices such as screens. The `iostream` library, which is included at the beginning of a program, is essential for this process. It provides two primary objects: `cin` and `cout`.

• `cin` (character input): Used to read input from the user. It fetches data from the standard input (usually the keyboard) and assigns it to variables within the program.
• `cout` (character output): Used to display information to the user. It sends data to the standard output (usually the screen).

In our program, we use `cin >>` to grab inputs, such as the user's last name and numerical values. For example, "Enter last name: " prompts the user to type their last name, which is stored in the `name` variable. These streams are crucial for any interactive program since they facilitate user interaction in a straightforward manner.

Variables and Constants

Variables and constants serve as storage containers in C++ programming, but they differ in terms of mutability. Understanding these differences is key to properly managing data within a program.

• **Variables**: These are named storage locations in memory, which can hold data that might change during program execution. For example, `int num` is a variable where user input is stored, and it can be reassigned as the program requires.
• **Constants**: These are similar to variables but with a crucial difference—they contain a fixed value that cannot change during the execution of the program. Declared using the `const` keyword, constants like `const int SECRET = 17` and `const int PRIME_NUM = 11` in our program provide fixed values used in calculations, ensuring consistency.

By using constants, you maintain stable reference points in your computations, making the code easier to read and less prone to errors since they give clear, invariable parameters. This becomes particularly useful for values like `SECRET` and `PRIME_NUM`, which are fundamental to the logic of the program's calculations.

Basic Arithmetic Operations

Arithmetic operations form the foundation of mathematical calculations in C++ programs, allowing you to perform basic math functions with variables and constants. In this exercise, the operations are central to calculating specific output values.

• **Multiplication (`*`)**: Used to scale variables by constant values or other variables. For instance, `100 * num` multiplies the input `num` by 100 to partially compute the `id`.
• **Addition (`+`)**: Adds values together, as seen when the partially calculated product is increased by the `SECRET` with `100 * num + SECRET`.
• **Subtraction (`-`)**: Deducts one value from another, which occurs when the `mysteryNum` is calculated: `num * PRIME_NUM - 3 * SECRET`.

These operations combined in formulas allow the program to compute the `id` as `3417` and the `mysteryNum` as `3689`, demonstrating the results of inputs and mathematical logic. Understanding these operations helps in debugging and extending program capabilities, creating more dynamic user interactions by integrating mathematical calculations.