Random number c

The rand() function in the C programming language is used to generate pseudo-random numbers. It is used in C to generate random numbers in the range 0 to RAND_MAX.

The rand() function is part of the standard C library <stdlib.h> so to use this function, we need to include the <stdlib.h> library.

Syntax of rand()

Parameters

• This function does not take any parameters.

Return Value

• This function returns the value between 0 and RAND_MAX where RAND_MAX is the macro that is defined in the <stdlib.h> library.

Note: The rand() function by default uses the value 1 as the seed to generate random numbers which leads to the generation of the same sequence of random numbers.

To prevent this, we can use srand() function to specify a new seed for rand() function.

Examples of rand() in C

Example 1: Illustration of rand() function

Time Complexity: O(1)
Space Complexity: O(1)

Example 2: Generate 10 Random Numbers