Question

Write a function called fillList that takes three parameters, an integer array, input file, and size. The function should fill the integer array with randomly generated values between two numbers lowLim and highLim read from the input file. in C++

Answer 1

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <cstring>

using namespace std;

void fillList(int *ary,ifstream &in,int size) {
   int lowLim, highLim;

   // read lower limit and upper limit
   in >> lowLim;
   in >> highLim;

   // store random number
   for (int i = 0;i < size;i++) {
       ary[i] = rand() % (highLim - lowLim) + lowLim;
   }
}

int main() {
   // for filename
   char filename[20];
   // array
   int *ary=NULL;
   // size of array
   int size;
   // for reading file
   ifstream in;

   // read input
   cout << "Enter the file name : ";
   fgets(filename,30,stdin);
   // new character to null character
   filename[strlen(filename) - 1] = '\0';
   cout << "Enter the array size : ";
   cin >> size;
   // array create
   ary = new int[size];
   // read file
   in.open(filename);
   // if file not found
   if (in.fail() == true) {
       cout << "File not found.";
   }
   else {
       // fill array
       fillList(ary,in,size);
   }

   for (int i = 0;i < size;i++) {
       cout << ary[i] << " ";
   }

   in.close();

   cout << endl;
   system("pause");
   return 0;
}