Mastering C Programming Concepts

What are the basic data types available in C?

• string

• int, float, double, char, void

• boolean

• array

Explain the difference between 'if' and 'switch' control structures.

• The 'if' structure is for conditional checks, while 'switch' is for evaluating multiple cases based on a single expression.

• 'if' is used for loops, while 'switch' is for single conditions.

• 'if' is a function, while 'switch' is a variable.

• 'if' can only evaluate two cases, whereas 'switch' can evaluate one case.

What is a function in C and how is it defined?

• A function in C is defined using the syntax: return_type function_name(parameter_list) { // function body }

• A function in C is created with the syntax: function_name { return_type(parameter_list) }

• A function in C is declared using the syntax: function_name return_type(parameter_list);

• A function in C is defined as function_name(parameter_list) { // function body }

Describe recursion and provide an example of a recursive function.

• An example of recursion is a function that calculates the sum of an array without calling itself.

• A recursive function is one that uses loops to repeat actions.

• Recursion is a method of sorting data in a list without any function calls.

• An example of a recursive function is the calculation of the factorial of a number: function factorial(n) { return n <= 1 ? 1 : n * factorial(n - 1); }

What is a pointer in C and how is it used?

• A pointer in C is a variable that holds the address of another variable, used for direct memory access and manipulation.

• A pointer in C is a variable that stores a string value.

• A pointer in C is a special data type that can only hold integer values.

• A pointer in C is a type of function that executes code.

How do you dynamically allocate memory in C?

• Use 'print(size)' to allocate memory

• Use 'new(size)' to allocate memory in C

• Use 'malloc(size)', 'calloc(num, size)', or 'realloc(ptr, new_size)' to dynamically allocate memory in C.

• Use 'allocate(size)' for dynamic memory

What are the standard file I/O functions in C?

• read, write, open, close

• input, output, save, load

• fopen, fclose, fread, fwrite, fprintf, fscanf

• create, delete, append, modify

How do you open and close a file in C?

• Use open() to create a file and close() to delete it.

• Use create() to open a file and delete() to close it.

• Use read() to open a file and write() to close it.

• Use fopen() to open a file and fclose() to close it.

What is the purpose of the 'return' statement in a function?

• To create a loop within the function.

• To end the function execution immediately.

• The purpose of the 'return' statement is to provide a value from a function to its caller.

• To define the function's parameters.

Explain the concept of scope in relation to variables in C.

• Scope in C is determined by the data type of the variable.

• Scope in C only applies to global variables.

• Scope in C defines where a variable can be accessed: local (within functions), global (throughout the program), and file scope (within a file).

• Variables in C have no scope restrictions.