? and : in if else loop code example

Example 1: if statement in c

#include 
int main()
{
  if (logic goes here)
  {
    CODE
  }
  else if (logic)
  {
    CODE
  }
  else{
    CODE
  }
  return 0
}

Example 2: elseif c++

if( a == 10 ) {
      cout << "Value of a is 10" << endl;
   } else if( a == 20 ) {
      // if else if condition is true
      cout << "Value of a is 20" << endl;
   }