Basics of Functions in C Language

What is the purpose of function declaration in C?

• To hide the function from the compiler

• To confuse the programmer

• To inform the compiler about the function's name, return type, and parameters before its actual definition.

• To increase the program's efficiency

Explain the syntax for function definition in C.

• return_type function_name(parameters) { // function body }

• return_type function_name(parameters) // function body }

• return_type function_name(parameters) { // function body }

• return_type function_name(parameters) // function body

What is a function prototype in C and why is it used?

• A function prototype in C is a declaration of a function that specifies the function's name, return type, and parameters without informing the compiler about the function's existence.

• A function prototype in C is a declaration of a function that specifies the function's name, return type, and parameters without providing the function body. It is used to inform the compiler about the function's existence and signature before its actual definition in the program.

• A function prototype in C is a declaration of a function that specifies the function's name, return type, and parameters with providing the function body.

• A function prototype in C is a definition of a function that specifies the function's name, return type, and parameters without providing the function body.

Discuss the concept of function parameters in C.

• In C, function parameters are the variables declared in the function declaration and definition that receive the values passed to the function when it is called.

• Function parameters in C are limited to a single data type

• Function parameters in C are always passed by reference

• Function parameters in C are optional

Why is the return type important in C functions?

• The return type specifies the type of value that the function will return to the calling code.

• The return type specifies the number of arguments the function takes

• The return type determines the function's name

• The return type defines the order of execution within the function

How do you call a function in C?

• FunctionName();

• functionName[];

• functionName{}();

• FunctionName{};

What is the difference between function declaration and function definition in C?

• Function declaration includes the return type, while function definition does not

• Function declaration is used for built-in functions, while function definition is used for user-defined functions

• Function declaration includes the function body, while function definition does not

• In function declaration, only the function signature is provided, whereas in function definition, the actual implementation of the function is included.

Can a function in C return multiple values? If yes, how?

• No, a function in C cannot return multiple values directly. However, you can achieve a similar effect by using pointers or structures to pass multiple values back from a function.

• No, but you can return multiple values by using recursion

• Yes, by using a switch statement to return different values

• Yes, by using global variables to store the values

Name any two built-in library functions in C that are used for I/O.

What is the purpose of the 'return' statement in C functions?

• The 'return' statement is used to terminate the function and return a value to the calling code.

• The 'return' statement is used to skip the function and move to the next statement.

• The 'return' statement is used to print a message to the console.

• The 'return' statement is used to declare a variable.