You are required to generate a file of 100 random numbers. The range of the numb

Question

You are required to generate a file of 100 random numbers. The range of the numbers is from 0 to an integer value read from the console. The output file’s format should match the following assuming range entered is 1000;

Random numbers from 0 to 1000:

Index Number                 Random Number

1                                     679

2                                     101

3                                         3

4                                      715

5                                      293

..

Write a program to receive the input filename from the console, and the value for the maximum number.

In C++, the function rand is used to generate trivial (non-crypotographic-quality) random numbers; it returns pseudo-random integer numbers between 0 and RAND_MAX ( a constant in <cstdlib>). The function prototype for rand is:

int rand();

To use rand to generate a pseudo-random number between 0 and a given maximum myInputValue, use

            myRandomNumber = rand() % (myInputValue +1);

(strictly speaking in C++ you should also initialize the random-number generator using the function “srand ()”- ignore this step).

Explanation / Answer

      
#include<iostream>
#include<conio.h>
#include <stdio.h>
#include<stdlib.h>
#include <time.h>
#include <fstream>
using namespace std;

int main()
{
   ofstream outputFl;
   char randomNmFileName[256];
   int myInputValue =0, myRandomNumber=0;
   srand (time(NULL));
  
   cout << "Enter File Name: " << endl;
   cin >> randomNmFileName ;
   outputFl.open(randomNmFileName);
   cout << "Enter the maximum value of random number: "<<endl;
   cin >> myInputValue;
   if (outputFl.is_open())
{
   outputFl << "Index Number           Random Number" << endl;
for (int i = 1; i <= 100; i++) {
myRandomNumber = rand() % (myInputValue +1);
outputFl << i << "                       " << myRandomNumber << " ";
}
   outputFl.close();
   }
   else {
      cout << "Problem in opening the specified file.";
   }
return 0;

  
}

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