Generating Random number from input range

[txnug]

I am not sure how to write this program. Any help is needed as I am stuck and this program is due soon. I am very very new to c++ so looking at other similar programs is of no help

Section 0 : A function that generates a random number of a given range.

Section 1 : Receive the range for the random number.

Section 2 : Receive how many random numbers to be generated.

Section 3 : Generates random numbers of the given range.

*/

#include <iostream>

#include <ctime>

using namespace std;

int myrand(int min, int max)

{

	 

}

int main()

{

	srand(time(NULL)); // It sets the random number seed.



	cout << "Input minimum number:";

	cin >> min;

	cout << "Input maximum number:";

	cin >> max;



	return 0;

}

[deleted account xyzzy]

http://www.cplusplus.com/reference/cstdlib/rand/

[txnug]

Could you give me some example code of where to begin here

[deleted account xyzzy]

(rand() % (max - min + 1)) + min

[txnug]

So I now have

#include <iostream>
#include <ctime>
using namespace std;
int myrand(int min, int max)
{
	int x = min + rand() % ((max + 1) - min);
	return x;
}
int main()
{
	int min;
	int max;
	cout << "Input maximum number:";
	cin >> max;
	cout << "Input minimum number:";
	cin >> min;

	srand(time(NULL)); // It sets the random number seed.		}
	


	return 0;
}

Am I going in the correct direction?

[deleted account xyzzy]

Could you give me some example code of where to begin here

The link I put up has example code.

[txnug]

Still not sure if i am heading in the correct direction here.

[txnug]

Still stuck on this if someone. can provide insoght

[keskiverto]

In principle, the answer is 'yes'.

However, if your intention is to learn to use random numbers with C++, then the answer is 'no'.

Here is a different example program: http://www.cplusplus.com/reference/random/uniform_int_distribution/

[deleted account xyzzy]

#include <iostream>
#include <cstdlib>  // srand / rand
#include <ctime>    // time

int myrand(int min, int max);

int main()
{
   srand(time(nullptr));

   std::cout << "Input minimum number: ";
   int min { };
   std::cin >> min;

   std::cout << "Input maximum number: ";
   int max { };
   std::cin >> max;

   std::cout << "\nA random number: " << myrand(min, max) << "\n\n";

   int ran_num { myrand(min, max) };

   std::cout << "Another random number: " << ran_num << '\n';
}

int myrand(int min, int max)
{
   return (rand() % (max - min + 1)) + min;
}

Input minimum number: 5
Input maximum number: 20

A random number: 16

Another random number: 13

C++ method for obtaining random numbers:

#include <iostream>
#include <random>

int myrand(int min, int max);

int main()
{
   std::cout << "Input minimum number: ";
   int min { };
   std::cin >> min;

   std::cout << "Input maximum number: ";
   int max { };
   std::cin >> max;

   std::cout << "\nA random number: " << myrand(min, max) << "\n\n";

   int ran_num { myrand(min, max) };

   std::cout << "Another random number: " << ran_num << '\n';
}

int myrand(int min, int max)
{
   // create a random engine that exists between function calls
   static std::default_random_engine rng(std::random_device{}());

   std::uniform_int_distribution<int> dis(min, max);

   return dis(rng);
}

Input minimum number: 5
Input maximum number: 20

A random number: 11

Another random number: 13

Using the C library random functions in C++ code is not recommended.

https://web.archive.org/web/20180123103235/http://cpp.indi.frih.net/blog/2014/12/the-bell-has-tolled-for-rand/

https://channel9.msdn.com/Events/GoingNative/2013/rand-Considered-Harmful

C++ has much better means to generate random numbers.

https://www.learncpp.com/cpp-tutorial/59-random-number-generation/