我刚学会了Ada中的Enums和Types,并决定编写一个小程序来练习:
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Integer_Text_IO; use Ada.Integer_Text_IO;
procedure Day is
type Day_Of_The_Week is (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday);
subtype Weekday is Day_Of_The_Week range Monday..Friday;
subtype Weekend is Day_Of_The_Week range Saturday..Sunday;
function is_Weekday ( dayOfTheWeek: in Day_Of_The_Week) return Boolean is
begin
if(--?--)
end is_Weekday;
selected_day_value : Integer;
selected_day : Day_Of_The_Week;
begin
Put_Line("Enter the number co-responding to the desired day of the week:");
Put_Line("0 - Monday");
Put_Line("1 - Tuesday");
Put_Line("2 - Wednesday");
Put_Line("3 - Thursday");
Put_Line("4 - Friday");
Put_Line("5 - Saturday");
Put_Line("6 - Sunday");
Get(selected_day_value);
selected_day = Day_Of_The_Week'pos(selected_day_value);
if( is_Weekday(selected_day))
Put_Line( Day_Of_The_Week'Image(selected_day) & " is a weekday." );
else
Put_Line( Day_Of_The_Week'Image(selected_day) & " is a weekday." );
end Day;
我遇到了if语句的问题。如何检查dayOfTheWeek是否处于工作日子类型或周末子类型?
答案 0 :(得分:9)
你想要
function is_Weekday ( dayOfTheWeek: in Day_Of_The_Week) return Boolean is
begin
return dayoFTheWeek in Weekday;
end is_Weekday;
此外,您希望
中的’Val
不是’Pos
selected_day := Day_Of_The_Week'val(selected_day_value);
您可以查看第二个Put_Line
中的字词!
答案 1 :(得分:2)
您无需检查此功能。在这种情况下,函数只会模糊发生的事情:
if Selected_Day in Weekday then
do stuff..
else
do other stuff...
end if;