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请指教一下..如果是ch是数字字符的话,isdigit(ch)返回是0,还是非0?

1103: IP判断

qu317058542 | 2007-11-28 11:02:37 | delete | edit
我发现是书上错了
....
调试的时候发现是非0的 
qu317058542 | 2007-11-28 09:57:35 | delete | edit
0 我翻了C99书的 
windy7926778 | 2007-05-09 22:52:28 | delete | edit
非0 
mykoma | 2007-05-09 22:37:33 | delete | edit
 

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