C++ STL 中的 iswalnum() 函数
C++ STL 中的 iswalnum() 函数检查给定的宽字符是否为一个字母数字字符,即一个数字 (0-9)、大写字母 (A-Z)、小写字母 (a-z) 或任何字母数字字符。
算法
Begin Initializes the characters. Call function iswalnum(c1) to check whether it is alphanumeric or not. If it is alphanumeric character, then value will be returned otherwise zero will be returned. End
示例代码
#include <cwctype> #include <iostream> using namespace std; int main() { wchar_t c1 = '/'; wchar_t c2 = 'a'; if (iswalnum(c1)) wcout << c1 << " is alphanumeric "; else wcout << c1 << " is not alphanumeric "; wcout << endl; if (iswalnum(c2)) wcout << c2 << " is alphanumeric "; else wcout << c2 << " is not alphanumeric "; return 0; }
输出
/ is not alphanumeric a is alphanumeric
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