Random意思是返回一个0~num-1之间的随机数。 random(num)是在stdlib.h中的一个宏定义。num和函数返回值都是喊唯整型数。
如需要在一个random()序列上生成真正意义的随机数,在执行其子序列时使用randomSeed()函数预设一个绝对的随机输入,例如在一个断开烂渗汪引脚上的analogRead()函数的返回值。
扩展资料
Random使用之前需要使用Randomize语句进行饥仔随机数种子的初始化。RANDOM产生的是伪随机数或者说是用一种复杂的方法计算得到的序列值,因此每次运算时需要一个不同的种子值。种子值不同,得到的序列值也不同。因此也就是真正的随机数了。
RANDOM产生的是伪随机数或者说是用一种复杂的方法计算得到的序列值,因此每次运算时需要一个不同的种子值。种子值不同,得到的序列值也不同。因此也就是真正的随机数了。这也正是RANDOMIZE随机初始化的作用。 VB里用 NEW RANDOM()来表示初始化。
参考资料来源:百度百科-random()
<random>头文件包含以下声明(数字对应的是ISO C++标准文档的章节号):
#include <initializer_list>namespace std {
// 26.5.3.1, class template linear_congruential_engine
template<class UIntType, UIntType a, UIntType c, UIntType m>
class linear_congruential_engine
// 26.5.3.2, class template mersenne_twister_engine
template<class UIntType, size_t w, size_t n, size_t m, size_t r,
UIntType a, size_t u, UIntType d, size_t s,
UIntType b, size_t t,
UIntType c, size_t l, UIntType f>
class mersenne_twister_engine
// 26.5.3.3, class template subtract_with_carry_engine
template<class UIntType, size_t w, size_t s, size_t r>
class subtract_with_carry_engine
// 26.5.4.2, class template discard_block_engine
template<class Engine, size_t p, size_t r>
class discard_block_engine
// 26.5.4.3, class template independent_bits_engine
template<class Engine, size_t w, class UIntType>
class independent_bits_engine
// 26.5.4.4, class template shuffle_order_engine
template<class Engine, size_t k>
class shuffle_order_engine
// 26.5.5, engines and engine adaptors with predefined parameters
typedef linear_congruential_engine<uint_fast32_t, 16807, 0, 2147483647>
minstd_rand0
typedef linear_congruential_engine<uint_fast32_t, 48271, 0, 2147483647>
minstd_rand
typedef mersenne_twister_engine<uint_fast32_t,
32,624,397,31,0x9908b0df,11,0xffffffff,7,
弯伍山 0x9d2c5680,15,0xefc60000,18,1812433253
>
mt19937
typedef mersenne_twister_engine<橘轮uint_fast64_t,
埋中 64,312,156,31,0xb5026f5aa96619e9,29,
0x5555555555555555,17,
0x71d67fffeda60000,37,
0xfff7eee000000000,43,
6364136223846793005>
mt19937_64
typedef subtract_with_carry_engine<uint_fast32_t, 24, 10, 24>
ranlux24_base
typedef subtract_with_carry_engine<uint_fast64_t, 48, 5, 12>
ranlux48_base
typedef discard_block_engine<ranlux24_base, 223, 23>
ranlux24
typedef discard_block_engine<ranlux48_base, 389, 11>
ranlux48
typedef shuffle_order_engine<minstd_rand0,256>
knuth_b
typedef implementation-defined
default_random_engine
// 26.5.6, class random_device
class random_device
// 26.5.7.1, class seed_seq
class seed_seq
// 26.5.7.2, function template generate_canonical
template<class RealType, size_t bits, class URNG>
RealType generate_canonical(URNG& g)
// 26.5.8.2.1, class template uniform_int_distribution
template<class IntType = int>
class uniform_int_distribution
// 26.5.8.2.2, class template uniform_real_distribution
template<class RealType = double>
class uniform_real_distribution
// 26.5.8.3.1, class bernoulli_distribution
class bernoulli_distribution
// 26.5.8.3.2, class template binomial_distribution
template<class IntType = int>
class binomial_distribution
// 26.5.8.3.3, class template geometric_distribution
template<class IntType = int>
class geometric_distribution
// 26.5.8.3.4, class template negative_binomial_distribution
template<class IntType = int>
class negative_binomial_distribution
// 26.5.8.4.1, class template poisson_distribution
template<class IntType = int>
class poisson_distribution
// 26.5.8.4.2, class template exponential_distribution
template<class RealType = double>
class exponential_distribution
// 26.5.8.4.3, class template gamma_distribution
template<class RealType = double>
class gamma_distribution
// 26.5.8.4.4, class template weibull_distribution
template<class RealType = double>
class weibull_distribution
// 26.5.8.4.5, class template extreme_value_distribution
template<class RealType = double>
class extreme_value_distribution
// 26.5.8.5.1, class template normal_distribution
template<class RealType = double>
class normal_distribution
// 26.5.8.5.2, class template lognormal_distribution
template<class RealType = double>
class lognormal_distribution
// 26.5.8.5.3, class template chi_squared_distribution
template<class RealType = double>
class chi_squared_distribution
// 26.5.8.5.4, class template cauchy_distribution
template<class RealType = double>
class cauchy_distribution
// 26.5.8.5.5, class template fisher_f_distribution
template<class RealType = double>
class fisher_f_distribution
// 26.5.8.5.6, class template student_t_distribution
template<class RealType = double>
class student_t_distribution
// 26.5.8.6.1, class template discrete_distribution
template<class IntType = int>
class discrete_distribution
// 26.5.8.6.2, class template piecewise_constant_distribution
template<class RealType = double>
class piecewise_constant_distribution
// 26.5.8.6.3, class template piecewise_linear_distribution
template<class RealType = double>
class piecewise_linear_distribution
} // namespace std
头文件是C,C++语言中对引用的定义.C#语言中,对类似形为的定义,称为引用命名空间(namespace).
随机渣或数Random类,属于system命名空间.
C#的引用语法是搏键:using System
使用代码是(例基梁巧):
Random random = new Random()
int r=random.Next(int RandomLimitMin, int RandomLimitMax)
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