How to Generate Random Double Numbers with Decimals in C ?

Generating Random Double Numbers with Decimals in C

In C , generating random numbers between two doubles in the format "xxxxx,yyyyy" involves utilizing the library features introduced with C 11 and the TR1 extensions.

Solution Outline

To generate random numbers in the specified format, follow the steps below:

1. Initialize the lower bound and upper bound of the desired range.
2. Create an instance of std::uniform_real_distribution with the specified bounds.
3. Instantiate a random number generator engine using std::default_random_engine.
4. Generate a random double number within the specified range using the distribution and random engine.

Code Example

<code class="cpp">#include <random>

int main()
{
   double lower_bound = 0;
   double upper_bound = 10000;
   std::uniform_real_distribution<double> unif(lower_bound, upper_bound);
   std::default_random_engine re;
   double a_random_double = unif(re);

   return 0;
}</code>

Additional Information

For further insights into random number generation in C , refer to the following resources:

• [John D. Cook's "Random number generation using C TR1":](https://www.johndcook.com/blog/2011/08/19/random-number-generation-using-cpp-tr1/)
• [Stroustrup's "Random number generation":](https://www.stroustrup.com/4282.html)

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