Question

我有这个Ada代码。

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

代码有什么问题？

Answer 1

来自this post：

问题在于＆＃39; A＆＃39;和＆＃39; Z＆＃39;可以来自Character或Wide_Character。最简单的修正是使类型明确;例如：对于字符范围内的字符＆＃39; A＆＃39; ..＆＃39; Z＆＃39;循环...结束循环;

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oupput：

ABCDEFGHIJKLMNOPQRSTUVWXYZ

是什么导致了这个Ada编译错误＆＃34;模棱两可的字符文字＆＃34;？

1 个答案: