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// isalnum example (C++)
#include <iostream> // std::cout
#include <string> // std::string
#include <locale> // std::locale, std::isalnum
int main ()
{
std::locale loc;
std::string str = "c3po...";
std::string::size_type i=0;
while ( (i<str.length()) && (std::isalnum(str[i])) ) {++i;}
std::cout << "The first " << i << " characters are alphanumeric.\n";
return 0;
}
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