See Summer snow on the winter of Rand () and srand () produce random number of summary, very good, study, and then have Baidu other people's results, the system summarizes. This article turns from Summer snow winter:
The standard library (included in ) provides two functions to help generate pseudo-random numbers:
Function 1: int rand (void );Returns a random integer between [seed, rand_max (0
Rand ()Returns a random value ranging from 0 to RAND_MAX. Before calling this function to generate a random number, you must use srand () to set the random number seed. If no random number seed is set, rand () will automatically set the random
Standard library (included in ) provides two functions to help generate pseudo-random numbers:function one: int rand (void);Returns a random integer between [seed, Rand_max (0X7FFF)), starting with the seed specified in Srand (seed).function two:
Srand () is to provide seed for rand ().
If srand inputs the same value each time, the random number generated each time is the same,
Rand ()That is to say, using a fixed value as the seed is a disadvantage. The common practice is
use of the Random function rand () and Srand () in C + +First, Rand ()Name of function: RandFunction: Random number generatorUsage: int rand (void);Header file: stdlib.hFunction Description:The internal implementation of RAND () is made with linear
First we have a general view of Rand&srand: Srand initializes random seeds, Rand produces random numbers, which are described in detail below.
RAND (generating random numbers)
Table header file:
If there is no srand () function and only RAND () function, the random numbers generated by each running program are the same. With the srand () function, the numbers generated each time are different.
In C ++, you can use the rand () function to
We know that the rand () function can be used to generate random numbers, but this is not a real random number, it is a pseudo random number, it is based on a number, we can call it a kind, A coefficient calculated based on a recursive
Rand and srand usageFirst, we need to have a general opinion on rand & srand: srand initializes random seeds, and rand generates random numbers. The following describes in detail.Rand (Random Number Generation)Header file: # includeDefine function:
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