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Chapter 7: Problem 7

include using namespace鈥� # In the following program, number the marked statements to show the order in which they will execute (the logical order of execution). #include using namespace std; void func(int val1, int val2); int main() { int num1, num2; ___ cout << "Please enter two integers." << endl; ___ cin >> num1 >> num2; ___ func (num1, num2); ___ cout << " The two integers are " << num1 << ", " << num2 << endl; ___ return 0; } void func(int val1, int val2) { int val3, val4; ___ val3 = val1 + val2; ___ val4 = val1 * val2; ___ cout << "The sum and product are " << val3 << " and " << val4 << endl; }

Short Answer

Expert verified
The logical order of execution is: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

Step by step solution

01

Starting Point of the Program

Identify the starting point of the program: The `main()` function is where the program begins execution in C++. Thus, we start with the first line inside the `main()` function.
02

First Statement in main()

The first statement to execute is `cout << "Please enter two integers." << endl;`, which prompts the user to enter two integers.
03

User Input

The next executable line in the `main()` function is `cin >> num1 >> num2;`. This statement captures user input and assigns it to `num1` and `num2`.
04

Function Call

After capturing the input, the line `func(num1, num2);` is executed next. This calls the function `func()` with `num1` and `num2` as arguments.
05

Function Execution - Sum Calculation

Inside `func()`, the first line `val3 = val1 + val2;` calculates the sum of `val1` and `val2`, storing the result in `val3`.
06

Function Execution - Product Calculation

The next line `val4 = val1 * val2;` calculates the product of `val1` and `val2`, storing the result in `val4`.
07

Printing Sum and Product

Next to execute in `func()` is `cout << "The sum and product are " << val3 << " and " << val4 << endl;`, which prints the sum and product of the two integers.
08

Return to main()

After completing the function `func()`, control returns to the `main()` function.
09

Print Integers

Back in `main()`, the line `cout << " The two integers are " << num1 << ...` prints the two integers entered by the user.
10

Program Termination

Finally, the statement `return 0;` is executed, which signals successful termination of the program.

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Key Concepts

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

Function Calls
In C++, function calls are a fundamental part of the language's control flow. They allow a program to execute a block of code in a different part of the program whenever needed.
Inside the `main()` function of our example program, a function call is made using `func(num1, num2);`. This specific call transfers control to the function `func`, with `num1` and `num2` passed as arguments.
  • Arguments: The values given to a function when it is called.
  • Function definition: The code block that outlines what should happen when the function is called.
After executing the code in `func`, control returns to the point following the function call in `main()`. These transitions between function calls and returns are crucial for organizing and managing larger programs efficiently.
I/O Operations
Input and Output (I/O) operations are essential for communicating with users in C++ programs. In our example program, there are several I/O operations using `cin` and `cout`.
The statement `cout << "Please enter two integers." << endl;` sends a message to the console, prompting the user to provide input.
Following this, `cin >> num1 >> num2;` is used to read the user's input values into the variables `num1` and `num2`.
  • `cout`: Stands for console output, which prints text to the console.
  • `cin`: Represents console input, reading data entered by the user.
These operations are user-friendly ways to interact with the program, and mastering them will enhance your ability to construct interactive C++ applications.
Program Execution Order
Understanding program execution order is vital to predict and control a program鈥檚 behavior. In C++, statements are executed sequentially, unless directed otherwise by control flow statements (e.g., loops or conditionals). In the example program, the order starts within the `main()` function.
First, `cout` executes to send a prompt. Then `cin` takes user input, after which `func` is called. This sequence of statements has an intentional flow, guiding the user through input collection and subsequent operations.
  • Sequential execution: C++ executes one statement after another by default.
  • Function call impact: Alters the flow by temporarily transferring control.
Recognizing this order helps with debugging and enhancing program logic.
C++ main Function
The `main()` function is crucial as it's the entry point of every C++ program. Every program begins execution from this function, making it necessary to structure your code logically within it.
In our example, after including essential headers and declarations, the `main()` houses the bulk of the operations, including:
  • User prompt and input.
  • Function calls.
  • Final result display using `cout`
Upon finishing these tasks, `main()` ends with `return 0;`, signaling that the program has completed successfully.
Understanding how to structure and use the `main()` function is key to building efficient and bug-free C++ applications.

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Most popular questions from this chapter

include #include using namespace std; void test(int first, int& second); int main() { int num; num = 5鈥� # What is the output of the following program? #include #include using namespace std; void test(int first, int& second); int main() { int num; num = 5; test(24, num); cout << num << endl; test(num, num); cout << num << endl; test(num * num, num); cout << num << endl; test(num + num, num); cout << num << endl; return 0; } void test(int first, int& second) { int third; third = first + second * second + 2; first = second - first; second = 2 * second; cout << first << " " << second << " " << third << endl; }

Identify the following items in the programming code shown below: a. Function prototype, function heading, function body, and function definitions b. Function call statements, formal parameters, and actual parameters c. Value parameters and reference parameters d. Local variables and global variables #include //Line 1 using namespace std; //Line 2 int one; //Line 3 void hello(int&, double, char); //Line 4 int main() //Line 5 { //Line 6 int x; //Line 7 double y; //Line 8 char z; //Line 9 . . . hello(x, y, z); //Line 10 . . . hello(x, y - 3.5, 'S'); //Line 11 . . . } //Line 12 void hello(int& first, double second, char ch) //Line 13 { //Line 14 int num; //Line 15 double y; //Line 16 int u ; //Line 17 . . . } //Line 18

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 7-7. #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 }

a. Explain the difference between an actual and a formal parameter. b. Explain the difference between a value and a reference parameter. c. Explain the difference between a local and a global variable.

Consider the following function definition: void defaultParam(int u, int v = 5, double z = 3.2) { int a; u = u + static_cast(2 * v + z); a = u + v * z; cout << "a = " << a << endl; } What is the output of the following function calls? a. defaultParam(6); b. defaultParam(3, 4); c. defaultParam(3, 0, 2.8);
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