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< cpp‎ | numeric‎ | random

The time function returns the current time of the system. So, every time we execute the code, the value passed to the seed function would change according to the time. Thus, a new random set of numbers get generated whenever we execute the program, unlike rand function. The standard value to the srand function is time(0).
The function srand is used to initialize the generated pseudo random number by rand function. It does not return anything. Here is the syntax of srand in C language.

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Pseudo-random number generation Srand Time Null Dev C%2b%2b

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Defined in header <cstdlib>

Seeds the pseudo-random number generator used by std::rand() with the value seed.

If rand() is used before any calls to srand(), rand() behaves as if it was seeded with srand(1).

Each time rand() is seeded with the same seed, it must produce the same sequence of values.

srand() is not guaranteed to be thread-safe.

[edit]Parameters

seed

the seed value

[edit]Return value

(none)

[edit]Notes

Generally speaking, the pseudo-random number generator should only be seeded once, before any calls to rand(), at the start of the program.It should not be repeatedly seeded, or reseeded every time you wish to generate a new batch of pseudo-random numbers.

Standard practice is to use the result of a call to time(0) as the seed.However, std::time() returns a std::time_t value, and

Contents

[edit]Parameters

[edit]Return value

[edit]Notes