Question

Write a C++ program that randomly generates N integer numbers (such that N is entered by the user) and then stores them to a text file (myNumbers.txt) sorted in increasing (non-decreasing) order.

Again, please notice that the size of the data (N) is known during the run time, not the compile-time (needs to be entered by the user after running the program).

Answer 1

Code:

#include<iostream>
#include<stdlib.h>
#include<time.h>
#include<fstream>
using namespace std;
int main(){
   srand(time(0));
   int n;
   cout<<"Enter N:";
   cin>>n;
   int i,j;
   int a[n];
   for(i=0;i<n;i++){
       a[i]=rand();
   }
   for(i=0;i<n;i++){
       for(j=0;j<n;j++){
           if(a[i]<a[j]){
               int tem;
               tem=a[i];
               a[i]=a[j];
               a[j]=tem;
           }
       }
   }
   ofstream f;
   cout<<"\n successfully stored numbers to a text file in sorted order.";
   f.open("output.txt"); //name of output file
   for(i=0;i<n;i++){
       f<<a[i]<<endl;
   }
}

Output:

text file: