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Chapter 7: Problem 4

include using namespace std; void func1(); void func2(); int main() { int num; cout << "Enter 1 or 2: "; cin >> 鈥� # What is the output of the following program? #include using namespace std; void func1(); void func2(); int main() { int num; cout << "Enter 1 or 2: "; cin >> num; cout << endl; cout << "Take "; if (num == 1) func1(); else if (num == 2) func2(); else cout << "Invalid input. You must enter a 1 or 2" << endl; return 0; } void func1() { cout << "Programming I." <

Short Answer

Expert verified
a. "Take Programming I."; b. "Take Programming II."; c. "Invalid input. You must enter a 1 or 2"; d. "Invalid input. You must enter a 1 or 2".

Step by step solution

01

Understanding the Program Structure

The program starts by including the iostream library and uses the standard namespace. It declares two functions, `func1` and `func2`, which are defined later. The `main` function prompts the user to enter a value (1 or 2), reads this input, and then either calls `func1`, `func2`, or prints an invalid input message.
02

Analyzing Input Case 1

If the user inputs `1`, the program will execute the branch where `if (num == 1)` is true. It first prints "Take " and then calls `func1`. The `func1` function outputs "Programming I." Therefore, the output will be: "Take Programming I.".
03

Analyzing Input Case 2

If the user inputs `2`, the elseif branch `else if (num == 2)` is executed. The program will print "Take " and then call `func2`. The `func2` function outputs "Programming II." Hence, the complete output will be: "Take Programming II.".
04

Analyzing Input Case 3

If the user inputs `3`, neither `if (num == 1)` nor `else if (num == 2)` is satisfied. The program will proceed to the `else` clause, which outputs: "Invalid input. You must enter a 1 or 2".
05

Analyzing Negative Input Case -1

If the user inputs `-1`, just like with the input `3`, neither the `if` nor the `else if` conditions hold true. The `else` part is executed, resulting in the output: "Invalid input. You must enter a 1 or 2".

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Key Concepts

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

Control Structures in C++
Control structures are fundamental in directing the flow of a C++ program. In this scenario, we encounter an `if-else` control structure, which decides which parts of the code to execute based on a condition. The program asks the user to enter either `1` or `2`. Depending on the input:
  • If the input is `1`, the program executes a specific block of code.
  • If the input is `2`, a different block is executed.
  • If neither, an error message is displayed.
The `if-else` statement allows handling multiple program paths based on different conditions.
This capability is vital for creating dynamic programs that respond to various inputs.
Function Calling and Execution
Functions are reusable blocks of code that perform specific tasks. They help in organizing code and make it reusable and easier to maintain. In the provided program, we have two functions:
  • `func1`: Outputs "Programming I." when called.
  • `func2`: Outputs "Programming II." when called.
The `main` function controls the program flow and based on user input, it calls either `func1` or `func2`. Function calls allow us to execute pre-defined code which can be run multiple times throughout a program.
This modular approach is efficient and helps in keeping the code clean and organized.
Input and Output in C++
Input and output (I/O) are crucial for interacting with users. In C++, I/O is commonly managed using streams from the iostream library. In this program:
  • `cout` is used to display text to the user. For instance, it asks the user to "Enter 1 or 2:" and outputs responses based on conditions.
  • `cin` is used to receive input from the user. Here, it captures the number entered by the user and stores it in the variable `num`.
Understanding I/O operations is essential for creating interactive programs where user data can influence program behavior.
Conditional Statements in C++
Conditional statements are used to perform different actions based on different conditions. In our program, conditional lines utilize the `if`, `else if`, and `else` keywords.
  • The `if` statement checks if the user's input is `1`. If true, it calls `func1`.
  • The `else if` statement checks if the input is `2`. If true, it calls `func2`.
  • The `else` statement catches any other input, ensuring that a meaningful message "Invalid input. You must enter a 1 or 2" is displayed for improper entries.
    • These conditional checks ensure the program can respond appropriately to a variety of user inputs.

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    Most popular questions from this chapter

    Write the definition of a void function that takes as input two decimal numbers. If the first number is nonzero, it outputs second number divided by the first number; otherwise, it outputs a message indicating that the second number cannot be divided by the first number because the first number is 0

    Write the definition of a void function that takes as input a decimal number and as output 3 times the value of the decimal number. Format your output to two decimal places.

    include using namespa鈥� # Consider the following program. What is its exact output? Show the values of the variables after each line executes, as in Example 7-6. #include using namespace std; void funOne(int& a); int main() { int num1, num2; num1 = 10; //Line 1 num2 = 20; //Line 2 cout << "Line 3: In main: num1 = " << num1 << ", num2 = " << num2 << endl; //Line 3 funOne(num1); //Line 4 cout << "Line 5: In main after funOne: num1 = " << num1 << ", num2 = " << num2 << endl; //Line 5 return 0; //Line 6 } void funOne(int& a) { int x = 12; int z; z = a + x; //Line 7 cout << "Line 8: In funOne: a = " << a << ", x = " << x << ", and z = " << z << endl; //Line 8 x = x + 5; //Line 9 cout << "Line 10: In funOne: a = " << a << ", x = " << x << ", and z = " << z << endl; //Line 10 a = a + 8; //Line 11 cout << "Line 12: In funOne: a = " << a << ", x = " << x << ", and z = " << z << endl; //Line 12 }

    Write the definition of a void function with three reference parameters of type int, double, and string. The function sets the values of the int and double variables to 0 and the value of the string variable to the empty string.

    Mark the following statements as true or false. a. \(A\) function that changes the value of a reference parameter also changes the value of the actual parameter. b. \(A\) variable name cannot be passed to a value parameter. c. If a \(C++\) function does not use parameters, parentheses around the empty parameter list are still required. d. In \(C++,\) the names of the corresponding formal and actual parameters must be the same. e. Whenever the value of a reference parameter changes, the value of the actual parameter changes. f. In \(C++,\) function definitions can be nested; that is, the definition of one function can be enclosed in the body of another function. g. Using global variables in a program is a better programming style than using local variables, because extra variables can be avoided. h. In a program, global constants are as dangerous as global variables. i. The memory for a static variable remains allocated between function calls.
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