syntax of if operator in c++ code example

Example 1: conditional operator in cpp

//(expression 1) ? expression 2 : expression 3
//If expression 1 evaluates to true, then expression 2 is evaluated.
   int x, y = 10;

   x = (y < 10) ? 30 : 40;
   cout << "value of x: " << x << endl; //prints 40

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;
   }