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Questions and Answers
What purpose do functions serve in a C++ program?
What purpose do functions serve in a C++ program?
Which of the following describes how the 'square' function in the C++ program functions?
Which of the following describes how the 'square' function in the C++ program functions?
What is the significance of breaking down complex problems into functions in programming?
What is the significance of breaking down complex problems into functions in programming?
In the program, what does the line 'm = square(n);' represent?
In the program, what does the line 'm = square(n);' represent?
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Which of the following statements about user-defined functions is true?
Which of the following statements about user-defined functions is true?
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A C++ program can contain multiple functions other than main()
A C++ program can contain multiple functions other than main()
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The 'square' function in the C++ program directly outputs the squared value to the console.
The 'square' function in the C++ program directly outputs the squared value to the console.
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It is recommended to simplify complex problems by breaking them into smaller functions.
It is recommended to simplify complex problems by breaking them into smaller functions.
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The parameter of the 'square' function is of type float.
The parameter of the 'square' function is of type float.
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'm = square(n);' is an example of function definition in C++.
'm = square(n);' is an example of function definition in C++.
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Study Notes
Programming I - Fall 2024, Part 5 - Functions
- C++ programs can have functions besides
main(). - A function is a set of statements performing a specific task.
- Complex problems can be broken down into smaller functions.
- A function prototype informs the compiler about the function's existence and type signatures.
- Functions can be called within
main()or other functions. - Function calls invoke a function's execution.
- Function definitions define how a function operates.
- Modular programming, compared to writing the whole solution in
main(), allows multiple programmers to work simultaneously, decreasing development time and creating more readable programs. - Predefined functions are grouped into libraries (e.g.,
cmath). -
sqrt(x)calculates the non-negative square root ofx. -
pow(x, y)calculatesxraised to the power ofy. -
floor(x)returns the largest integer less thanx. - A void function doesn't return a value.
- Functions may not require any parameters.
- Scope determines where a variable is accessible within a program.
- Local variables are defined and accessible only within a specific function.
- Global variables are declared outside all functions and accessible from any function.
- Reference variables act as aliases to existing variables.
Passing Parameters
- C++ offers pass-by-value and pass-by-reference parameter passing methods in functions.
- Pass-by-value creates a copy of the actual parameter's value. Changes to the formal parameter within the function don't affect the original parameter.
- Pass-by-reference passes the memory address of the actual parameter. Changes to the formal parameter directly affect the original variable.
Example - Greatest Common Divisor (GCD)
- The
gcd()function computes the GCD of two integers. - Example input: 30, 75. Example output: 15. GCD is found by iterating until a common divisor is found.
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Description
This quiz covers the functions used in C++ programming, focusing on their definitions, prototypes, and the importance of modular programming. You will explore how functions can simplify complex problems and improve code readability and collaboration. Test your knowledge on predefined functions and their applications.
