if(expression 1)
{
  Statement(s) to be executed if expression 1 is true
}     
else if(expression 2)
{
  Statement(s) to be executed if expression 2 is true
}
else if(expression 3)
{
  Statement(s) to be executed if expression 3 is true
}
else
{
  Statement(s) to be executed if no expression is true
}