Function and Procedure in C

What is the main difference between a procedure and a function in C?

• A function returns a value, while a procedure does not.

• A function can be called recursively, while a procedure cannot.

• A function modifies the input parameters, while a procedure does not.

• A function can have multiple return statements, while a procedure cannot.

Answer explanation

A function returns a value, while a procedure does not.

Can a procedure return a value in C?

• No

• Yes

• Maybe

• Sometimes

Answer explanation

In C, when you declare a function as a procedure (void function), it doesn't return any value explicitly using the return statement. Instead, it simply performs a task or a series of tasks without returning a result.

Can a function call another function in C?

• Rarely

• Sometimes

• Yes

• No

Answer explanation

Yes, a function can call another function in C. This is a common practice in programming to divide tasks into smaller, reusable functions for better organization and readability.

Do procedures have a return type in C?

• Sometimes

• Only in certain cases

• No

• Yes

Answer explanation

Procedures in C do not have a return type, so the correct answer is 'No'.

Which of the two, function or procedure, is more commonly used in C programming?

• Procedure

• Both

• Neither of them

• Function

Answer explanation

Functions are more commonly used in C programming compared to procedures. Functions allow for code reusability and modularity, making them a preferred choice in C programming.

In terms of reusability, which is more beneficial - functions or procedures?

• Neither of them

• Both of them

• Procedures

• Functions

Answer explanation

Functions are more beneficial in terms of reusability compared to procedures because functions can be called multiple times with different inputs, making them versatile and reusable in various parts of a program.

What is the primary purpose of a function in C programming?

• To encapsulate a set of instructions that can be reused multiple times.

• To make the code more complex

• To slow down the program execution

• To confuse other programmers

Answer explanation

The primary purpose of a function in C programming is to encapsulate a set of instructions that can be reused multiple times.

How are functions and procedures declared differently in C?

• Functions have a void return type, procedures have no return type specified.

• Functions and procedures are declared the same way in C.

• Functions have a return type specified, procedures have a void return type.

• Functions have a void return type, procedures have a return type specified.

Answer explanation

Functions have a return type specified, procedures have a void return type. This is the key difference between how functions and procedures are declared in C.

Can a function have local variables in C?

• No

• Sometimes

• Rarely

• Yes

Answer explanation

Yes, a function can have local variables in C. Local variables are declared within the function body and are only accessible within that function.

Discuss the differences between pass by value and pass by reference in C functions.

• Pass by value involves passing a copy of the actual parameter's value in C functions.

• Pass by reference involves passing the memory address of the actual parameter in C functions.

• Parameters in C functions are always passed by reference.

• Pass by value in C functions involves passing the memory address of the actual parameter.

Answer explanation

In C, parameter passing involves passing arguments to functions or procedures when they are called. There are two main methods: pass by value and pass by reference. Pass by value involves passing a copy of the actual parameter's value, while pass by reference involves passing the memory address of the actual parameter. Parameters in C are usually passed by value, but pass by reference can be achieved using pointers.