<一>Characters of the test piece(on the street stalls) 1,isalnum() related functionsEnglish alphabetEnglish lettersAlphabet,Arabic numerals digital header file digit isalnum(alphabet,digit arabic numberals) 检查字符是否为英文字母 macro definition paradigm 字符数组元素枚举即长度范围控制及数组长度在for循环...