是什么原因导致这个Ada编译错误“模糊字符文字”？

Question

我有这个Ada密码。

with Ada.Text_IO; 
use Ada.Text_IO;

procedure for_Loop is
begin
    for Counter in 'A'..'Z' loop
        Put(Counter);   
    end loop;
    New_Line;
end for_Loop;

Ada编译器(gnatmake)输出这些错误消息。

gcc -c for_loop.adb
for_loop.adb:6:24: ambiguous character literal
for_loop.adb:6:24: possible interpretation: Character
for_loop.adb:6:24: possible interpretation: Wide_Character
for_loop.adb:6:24: possible interpretation: Wide_Wide_Character
gnatmake: "for_loop.adb" compilation error

密码怎么了？

Answer 1

来自这个职位

问题是'A‘和'Z’可能来自任何一个字符或Wide_Character。最简单的修正是使类型显式化；例如:字符范围'A‘中的字符字符。“z”圈..。末端回路；

with Ada.Text_IO; 
use Ada.Text_IO;

procedure for_Loop is
begin
    for Counter in Character range 'A'..'Z' loop
        Put(Counter);   
    end loop;
    New_Line;
end for_Loop;

这是外置：

ABCDEFGHIJKLMNOPQRSTUVWXYZ