C Programming Quiz

What is the purpose of a function in C programming?

• To store data permanently

• To manage memory

• To perform a specific task

• To define variables

Answer explanation

In C programming, a function is designed to perform a specific task, allowing for code reusability and organization. This makes it easier to manage complex programs by breaking them into smaller, manageable pieces.

Which part of a function contains the code that executes when the function is called?

• Function prototype

• Function header

• Function body

• Function declaration

Answer explanation

The function body contains the actual code that runs when the function is called. It includes the statements that define what the function does, making it the correct choice.

What is recursion in programming?

• A method to repeat a block of code

• A function calling itself

• A technique to manage memory

• A way to define variables

Answer explanation

Recursion in programming refers to a function that calls itself to solve a problem. This allows for tasks to be broken down into smaller, more manageable subproblems, making it a powerful technique for certain algorithms.

What is the correct syntax for a function declaration in C?

• function_name(data_type arg1, data_type arg2);

• function_name(data_type arg1, data_type arg2) data_type;

• data_type function_name(data_type arg1, data_type arg2);

• data_type function_name(arg1, arg2);

Answer explanation

The correct syntax for a function declaration in C is 'data_type function_name(data_type arg1, data_type arg2);'. This format specifies the return type, function name, and parameters with their types.

Which storage class preserves the value of a variable across function calls?

• Automatic

• Register

• Static

• External

Answer explanation

The 'static' storage class preserves the value of a variable between function calls, allowing it to retain its state. In contrast, 'automatic' and 'register' variables do not maintain their values after the function exits.

What is the purpose of the 'extern' keyword in C?

• To declare a local variable

• To define a function prototype

• To declare a global variable accessible across files

• To allocate memory

Answer explanation

The 'extern' keyword in C is used to declare a global variable that can be accessed across multiple files. This allows for better modularity and code organization, making it the correct choice.

How do you pass an array to a function in C?

• By passing each element individually

• By passing the array size

• By passing the array name without brackets

• By passing a pointer to the array

Answer explanation

In C, you pass an array to a function by using the array name without brackets. This effectively passes a pointer to the first element of the array, allowing the function to access the entire array.

What does the 'register' storage class suggest to the compiler?

• To allocate static memory

• To store the variable in a CPU register

• To make the variable global

• To store the variable in memory

Answer explanation

The 'register' storage class suggests to the compiler to store the variable in a CPU register, which allows for faster access compared to regular memory. This is why the correct choice is 'To store the variable in a CPU register'.

What is the result of using the 'sizeof' operator on an array in C?

• An error if the array is not defined

• The size of the first element in the array

• The total size in bytes of the array

• The number of elements in the array

What does the 'volatile' keyword indicate in C programming?

• The variable is stored in read-only memory

• The variable can be optimized by the compiler

• The variable is a constant

• The variable can change unexpectedly