Help me in solving LCPPCL115 problem

help
,
1

My issue

Write a program which does the following:

Declare a variable num and store a user defined input from the console in it.
Declare a variable a and initialise it to 0.
Use the while syntax to create a loop, output the following to the console:
Print a in separate lines as long as it is less than num.
Increment a by 1 in each iteration.

My code

#include <bits/stdc++.h>
using namespace std;

int main() {

  int a=0;
  cin >>a; 
  // Complete the code
  
  while(a<num){
      cout<<a<<endl;
      a=a+1;
  }
}

Learning course: ATT - C++
Problem Link: User Input Loop in ATT - C++