C++ 生成 0 到 10 之间的随机数
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Generate Random number between 0 and 10
提问by karthik
How can i generate Random numbers between 0 and 10? Can I have a sample for this random number generation?
如何生成0到10之间的随机数？我可以为这个随机数生成提供一个样本吗？
回答by relaxxx
1) You shouldn't use rand(), it has bad distribution, short period etc...
1）你不应该使用rand()它，它有分布不好，周期短等......
2) You shouldn't use %xwhen MaxValue % x != 0because you mess your uniform distribution (suppose you don't use rand()), e.g. 32767 % 10 = 7so number 0-7 are more likely to get
2）你不应该使用%xwhenMaxValue % x != 0因为你弄乱了你的均匀分布（假设你不使用 rand()），例如32767 % 10 = 7数字 0-7 更有可能得到
Watch this for more info: Going native 2013 - Stephan T. Lavavej - rand() Considered Harmful
观看此了解更多信息：Going native 2013 - Stephan T. Lavavej - rand() 被认为有害
You should use something like:
你应该使用类似的东西：
#include <random>
std::random_device rdev;
std::mt19937 rgen(rdev());
std::uniform_int_distribution<int> idist(0,10); //(inclusive, inclusive)
I in my codes use something like this:
我在我的代码中使用这样的东西：
template <typename T>
T Math::randomFrom(const T min, const T max)
{
static std::random_device rdev;
static std::default_random_engine re(rdev());
typedef typename std::conditional<
std::is_floating_point<T>::value,
std::uniform_real_distribution<T>,
std::uniform_int_distribution<T>>::type dist_type;
dist_type uni(min, max);
return static_cast<T>(uni(re));
}
NOTE: the implementation is not thread safe and constructs a distribution for every call. That's inefficient. But you can modify it for your needs.
注意：该实现不是线程安全的，并且为每个调用构造一个分布。那是低效的。但是您可以根据需要对其进行修改。
回答by karthik
/* rand example: guess the number */
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main ()
{
int iSecret, iGuess;
/* initialize random seed: */
srand ( time(NULL) );
/* generate secret number: */
iSecret = rand() % 10 + 1;
do {
printf ("Guess the number (1 to 10): ");
scanf ("%d",&iGuess);
if (iSecret<iGuess) puts ("The secret number is lower");
else if (iSecret>iGuess) puts ("The secret number is higher");
} while (iSecret!=iGuess);
puts ("Congratulations!");
return 0;
}
iSecretvariable will provide the random numbers between 1 and 10
iSecret变量将提供 1 到 10 之间的随机数
回答by juanchopanza
See this example of a uniform integer distribution in boost::random:
请参阅以下中的均匀整数分布示例boost::random：
回答by Fortega
random_integer = rand()%10;should do the trick I guess.
random_integer = rand()%10;我猜应该可以解决问题。
random_integer = rand()%11;for all numbers between 0 and 10, 10 included...
random_integer = rand()%11;对于 0 到 10 之间的所有数字，包括 10...
