Question 1

What are the basic data types in C?

Accepted Answer

The basic data types in C are:
1. int: represents integer values.
2. float: represents floating-point numbers.
3. double: represents double-precision floating-point numbers.
4. char: represents a single character.
5. _Bool: represents boolean values (1 for true and 0 for false).

Question 2

What is the use of a pointer in C?

Accepted Answer

A pointer in C is a variable that stores the address of another variable in memory. It is used for several purposes such as dynamic memory allocation, passing variables to functions by reference, and building complex data structures like linked lists, trees, and graphs.

Question 3

What is the difference between the stack and the heap in C?

Accepted Answer

The stack is a region of memory where the program's local variables and function call information are stored. It has a limited size and follows a last-in, first-out (LIFO) pattern. The heap, on the other hand, is a larger, more flexible region of memory used to allocate memory dynamically during the program's execution. Memory is allocated and deallocated in the heap using functions like malloc() and free().

Question 4

How do you declare and initialize an array in C?

Accepted Answer

To declare an array in C, you can use the following syntax:
data_type array_name[array_size];

Question 5

What are the differences between a struct and a union in C?

Accepted Answer

A struct and a union are both user-defined data types, but they differ in the way they store their member variables. In a struct, each member has its own space in memory, and the size of the struct is the sum of its members' sizes. In a union, all the members share the same memory location, and the size of the union is the same as the size of its largest member. This means that at any given time, a union can store the value of only one of its members.

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