C++ Program:

Example:

#include <iostream>
using namespace std;

int main() {
  int num;
  cout<<"Enter your last number: ";
  cin>>num;
  cout<<"Your odd numbers are : ";
  for (int i=1; i<num; i++)
    if(i%2!=0) cout<<i<<" ";
  return 0;
}

Output:

  Enter your last number : 6
  Your odd numbers are : 1 3 5

You should know first :

Odd numbers: Numbers not perfectly divisible by 2

(number % 2 != 0)

So, we are using a for loop till the last number entered and check every value for odd

for(int i=0; i<LastValue; i++) {
  //Check every 'i' for odd, if odd then print
}