C Language: rand function
(Generate Pseudo-Random Number)
In the C Programming Language, the rand function returns a number between 0 and RAND_MAX.
Syntax
The syntax for the rand function in the C Language is:
int rand(void);
Note
- Use the srand function to provide a seed value for the rand function. The seed value determines a particular sequence of random numbers to generate when calling the rand function. If a program always uses the same seed value, the rand function will always get the same sequence of numbers from the rand function.
- If the srand function is not used to provide a seed value, the seed value is assumed to be 1.
Returns
The rand function returns a number between 0 and RAND_MAX (inclusive).
Required Header
In the C Language, the required header for the rand function is:
#include <stdlib.h>
Applies To
In the C Language, the rand function can be used in the following versions:
- ANSI/ISO 9899-1990
Similar Functions
Other C functions that are similar to the rand function:
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