Generate Randomized Sequence of Given Range of Numbers in C++

At first let us discuss about the rand() function. rand() function is a predefined method of C++. It is declared in <stdlib.h> header file. rand() is used to generate random number within a range. Here min_n is the minimum range of the random numbers and max_n is the maximum range of the numbers. So rand() will return the random numbers between min_n to (max_n – 1) inclusive of the limit values. Here if we mention lower and upper limits as 1 and 100 respectively, then rand() will return values from 1 to (100 – 1). i.e. from 1 to 99.

Algorithm

Begin
   Declare max_n to the integer datatype.
      Initialize max_n = 100.
   Declare min_n to the integer datatype.
      Initialize min_n = 1.
   Declare new_n to the integer datatype.
   Declare i of integer datatype.
   Print “The random number is:”.
   for (i = 0; i < 10; i++)
      new_n = ((rand() % (max_n + 1 - min_n)) + min_n)
   Print the value of new_n.
End.

Example

#include <iostream>
#include <stdlib.h>
using namespace std;
int main() {
   int max_n = 100;
   int min_n = 1;
   int new_n;
   int i;
   cout<<"The random number is: \n";
   for (i = 0; i < 10; i++) {
      new_n = ((rand() % (max_n + 1 - min_n)) + min_n);
      //rand() returns random decimal number.
      cout<<new_n<<endl;
   }
   return 0;
}

Output

The random number is:
42
68
35
1
70
25
79
59
63
65