how to write if statements in c++ code example

Example 1: 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;
   }

Example 2: if else program in c ++

if (condition) {
    // block of code if condition is true
}
else {
    // block of code if condition is false
}