case - else statement

case-else语句在case标签之后使用else术语，就像if-then-else结构一样。

语法 (Syntax)

case-else语句的语法是 -

case (expression) of
   L1 : S1;
   L2 : S2;
   ...
   ...
   Ln: Sn;
else
   Sm;
end;

流程图 (Flow Diagram)

例子 (Example)

以下示例说明了该概念

program checkCase;
var
   grade: char;
begin
   grade := 'F';
   case (grade) of
      'A' : writeln('Excellent!' );
      'B', 'C': writeln('Well done' );
      'D' : writeln('You passed' );
   else
      writeln('You really did not study right!' );
    end;     
   writeln('Your grade is  ', grade );
end.

编译并执行上述代码时，会产生以下结果 -

You really did not study right!
Your grade is F