10 Questions
What is the purpose of a function declaration in C programming?
To inform the compiler about the existence of a function
What is the syntax for a function declaration in C programming?
return_type function_name(parameter list);
What is the purpose of a function definition in C programming?
To define the actual statements of the function
What happens when a function is called in C programming?
The program control is transferred to the function
What is the purpose of passing parameters to a function in C programming?
To provide data to the function for processing
What is the term for passing a copy of the original value to a function in C programming?
Call by Value
What is the term for a function that calls itself in C programming?
Function Recursion
What is the primary difference between a function with a return value and a function without a return value in C programming?
The presence or absence of a return statement
Which of the following is a characteristic of a user-defined function in C programming?
It can be called with or without arguments and might return values
What is the purpose of a return statement in a function in C programming?
To return control to the calling function
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
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.
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