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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_isalpha.htm below:

C++ Locale Library - isalpha

It checks if character is alphabetic.

Following is the declaration for std::isalpha.

int isalpha ( int c );

int isalpha ( int c );

c − Character to be checked, casted to an int, or EOF.

It returns a value different from zero.

No-throw guarantee − this function never throws exceptions.

In below example for std::isalpha.

#include <stdio.h>
#include <ctype.h>
int main () {
   int i=0;
   char str[]="C++";
   while (str[i]) {
      if (isalpha(str[i])) printf ("character %c is alphabetic\n",str[i]);
      else printf ("character %c is not alphabetic\n",str[i]);
      i++;
   }
   return 0;
}

The sample output should be like this −

character C is alphabetic
character + is not alphabetic
character + is not alphabetic          

locale.htm

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