C++ Program:

Example:

#include <iostream>
using namespace std;

int main() {
  int n1, n2;
  cout<<"Enter two numbers: ";
  cin>>n1>>n2;

  if(n1>n2) cout<<n1;
  else cout<<n2;

  cout<<"is the largest number"
  return 0;
}

Output:

  Enter two numbers : 7
  5
  7 is the largest number

Here, we use 2 variables (above code n1 & n2) to take numbers from the user

Now, check for the largest number using if statement

if(n1>n2){
  // if true print n1
}
else {
  // if false print n2
}

OR

if(n1<n2){
  // if true print n2
}
else {
  // if false print n1
}