Question

Write a C++ program that:

Allow the user to enter the size of the matrix such as N.

Call a function to do the following:

Create a vector size n X n

Populate the vector with n²distinct RANDOM integers.

Answer 1

#include <iostream>
#include <vector>
#include <cstdlib>
#include <ctime>
#include <iomanip>
using namespace std;

int main() {
   //Declaring variable
int n;
srand(time(0));
//getting the number enterd by the user
   cout<<"Enter the size of the matrix :";
   cin>>n;
  
   //Declaring vector of 'n' rows and 'n' columns
   vector< vector<int> >matrix(n,vector<int>(n));
  
   /* generating the random numbers and
   * populating those numbers into a vector
   */
   for(int i=0;i<n;i++)
   {
       for(int j=0;j<n;j++)
       {
           matrix[i][j]=rand()%1000;
       }
   }

//Displaying the elements inside the vector
   for(int i=0;i<n;i++)
   {
       for(int j=0;j<n;j++)
       {
cout<<matrix[i][j]<<" ";
       }
       cout<<endl;
   }      
   return 0;
}

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output: