What are library functions in c?

C is a powerful programming language that provides many built-in functions, also known as library functions, which programmers can use to perform various tasks. Here are some of the most commonly used library functions in C:

1. Input and Output (stdio.h):

• printf(): used to display output on the screen
• scanf(): used to read input from the user

2. String handling (string.h):

• strlen(): used to find the length of a string
• strcpy(): used to copy one string to another
• strcat(): used to concatenate two strings
• strcmp(): used to compare two strings

3. Math (math.h):

• pow(): used to find the power of a number
• sqrt(): used to find the square root of a number
• fabs(): used to find the absolute value of a number
• sin(), cos(), tan(): used to find the sine, cosine, and tangent of an angle

4. Memory handling (stdlib.h):

• malloc(): used to dynamically allocate memory at runtime
• free(): used to deallocate memory that was previously allocated with malloc()

By using these functions, programmers can save time and effort when developing their programs.

Library functions in C are also inbuilt functions in C language. These inbuilt functions are located in some common location, and it is known as the library. All the functions are used to execute a particular operation. These library functions are generally preferred to obtain the predefined output.