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Questions and Answers
What is the purpose of a function declaration in C programming?
What is the purpose of a function declaration in C programming?
What is the syntax for a function declaration in C programming?
What is the syntax for a function declaration in C programming?
What is the purpose of a function definition in C programming?
What is the purpose of a function definition in C programming?
What happens when a function is called in C programming?
What happens when a function is called in C programming?
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What is the purpose of passing parameters to a function in C programming?
What is the purpose of passing parameters to a function in C programming?
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What is the term for passing a copy of the original value to a function in C programming?
What is the term for passing a copy of the original value to a function in C programming?
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What is the term for a function that calls itself in C programming?
What is the term for a function that calls itself in C programming?
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What is the primary difference between a function with a return value and a function without a return value in C programming?
What is the primary difference between a function with a return value and a function without a return value in C programming?
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Which of the following is a characteristic of a user-defined function in C programming?
Which of the following is a characteristic of a user-defined function in C programming?
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What is the purpose of a return statement in a function in C programming?
What is the purpose of a return statement in a function in C programming?
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Study Notes
Function Classification
- Functions can be classified into four types based on arguments and return values:
- Functions with no arguments and no return value
- Functions with no arguments and with return value
- Functions with arguments and with no return value
- Functions with arguments and with return value
Passing Parameters to Functions
- In C, there are two types of parameters: actual parameters and formal parameters
- Actual parameters are specified in the calling function, while formal parameters are declared in the called function
- There are two methods to pass parameters from the calling function to the called function:
- Call by Value
- Call by Reference
Call by Value
- In call by value, a copy of the actual parameter values is copied to the formal parameters
- Changes made to the formal parameters do not affect the actual parameters
- Example: Swapping two values using call by value
Call by Reference
- In call by reference, the memory location address of the actual parameters is copied to the formal parameters
- Changes made to the formal parameters affect the actual parameters
- Example: Swapping two values using call by reference
Recursion
- A function that calls itself is known as a recursive function
- Recursion is a technique where a function calls itself repeatedly until it reaches a base case
- Example: Sum of natural numbers using recursion
Function Declaration and Definition
- A function declaration tells the compiler that a function with a given name is defined somewhere else in the program
- A function definition consists of the actual statements that are executed when the function is called
- Syntax for function declaration:
return_type function_name(parameter list); - Syntax for function definition:
return_type function_name(para1_type para1_name, para2_type para2_name) { // body of the function }
Function Call
- A function call is a statement that instructs the compiler to execute the function
- The function call includes the function name and parameters
- Example: Calling the
sumfunction with arguments 10 and 30
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Description
This quiz covers different types of functions in programming, including those with and without arguments and return values. It includes examples and explanations from a computer science lecture.
