The C Standard does not guarantee the quality of the random sequence produced. In the past, some implementations of rand had serious issues in distribution and randomness of the generated numbers. The usage of rand is not recommended for serious random number generation needs, like cryptography.
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Nov 29, 2020 rand The rand function is used in C/C to generate random numbers in the range 0, RANDMAX). Note: If random numbers are generated with rand without first calling srand, your program will create the same sequence of numbers each time it runs. Apr 21, 2018 Does rngd -r /path/to/file inject into /dev/urandom in addition to /dev/random? Hot Network Questions Is the Higgs mechanism used in 'Solaris' for the screen and how does Lem generate mass?
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Description
The C library function int rand(void) returns a pseudo-random number in the range of 0 to RAND_MAX.
RAND_MAX is a constant whose default value may vary between implementations but it is granted to be at least 32767.
Declaration
Following is the declaration for rand() function.
Parameters
NA
Return Value
This function returns an integer value between 0 and RAND_MAX.
Example
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The following example shows the usage of rand() function.
Let us compile and run the above program that will produce the following result −
