Random Number in C++

Random Number in C++

Definition:-

There are many cases where you will wish to generate a random number. There are actually two functions you will need to know about random number generation. The first is rand(), this function will only return a pseudo random number. The way to fix this is to first call the srand() function.

Following is a simple example to generate few random numbers. This example makes use of time() function to get the number of seconds on your system time, to randomly seed the rand() function –

Program:-

Input:-

#include <iostream>

#include <ctime>

#include <cstdlib>

using namespace std;

int main () {

   int i,j;

   // set the seed

   srand( (unsigned)time( NULL ) );

   /* generate 10  random numbers. */

   for( i = 0; i < 10; i++ ) {

      // generate actual random number

      j = rand();

      cout <<" Random Number : " << j << endl;

   }

   return 0;

}

Output:-

Output 2: