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Seed for pseudorandom number generation
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Untuk membuat program mengimplementasikan angka random sederhana dengan c, kita perlu mengetahui cara membangkitkan dan cara menampilkan bilangan random tersebut, bilangan random bisa di buat secara otomatis oleh komputer, tentu saja setiap komputer pasti berbeda beda dalam menentukan bilangan random, makanya kita perlu mengetahui awal bagaimana membangkitkan. Dec 12, 2009 Strange problem with rand, srand and.well, random numbers in general ^^' Drake Aran. First of all, thank you all for your hard work guys! Now the code (which is ready to be compiled. I use Dev-C, by the way): HERE'S THE LINK (too long for the forum's limitations on characters number). Your program should only call srand once! If you call it before every all to rand, then very bad things will happen. Time has a return resolution of 1 second, so you may then only produce one random number / second. The srand function in C seeds the pseudo random number generator used by the rand function. The seed for rand function is 1 by default. It means that if no srand is called before rand, the rand function behaves as if it was seeded with srand(1).
The latest version of this topic can be found at srand.
Sets the starting seed value for the pseudorandom number generator.
Syntax
Parameters
seed
Seed for pseudorandom number generation
Remarks
The
srand
function sets the starting point for generating a series of pseudorandom integers in the current thread. To reinitialize the generator to create the same sequence of results, call the srand
function and use the same seed
argument again. Any other value for seed
sets the generator to a different starting point in the pseudorandom sequence. rand
retrieves the pseudorandom numbers that are generated. Calling rand
before any call to srand
generates the same sequence as calling srand
with seed
passed as 1.Requirements
Routine | Required header |
---|---|
srand | <stdlib.h> |
For additional compatibility information, see Compatibility in the Introduction.
Example
See the example for rand.
.NET Framework Equivalent
See Also
Floating-Point Support
rand
rand
- The C Standard Library
- C Standard Library Resources
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- C Programming Resources
C++ How To Use Srand
- Selected Reading
Description
Dev C++ Srand
The C library function void srand(unsigned int seed) seeds the random number generator used by the function rand.
Declaration
Following is the declaration for srand() function.
Parameters
C++ Srand Time Null
- seed − This is an integer value to be used as seed by the pseudo-random number generator algorithm.
Srand C++ Library
Return Value
This function does not return any value.
Example
The following example shows the usage of srand() function.
Let us compile and run the above program that will produce the following result −
Dev C++ Random
stdlib_h.htm