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

C++ Locale Library - scan_not

It returns first character not in category and returns the first character in the range [low,high) that does not classify into any of the categories specified in m. If no such character is found in the range, high is returned.

Following is the declaration for std::ctype::scan_not.

	
const char_type* scan_not (mask m, const char_type* low, const char_type* high) const;

const char_type* scan_not (mask m, const char_type* low, const char_type* high) const;

• m − It is a bitmask of member type mask.

• low,high − It is a pointer to the beginning and end of the sequence of characters.

It returns a pointer to the first element in the range that classifies, or high if none is found.

Strong guarantee − if an exception is thrown, there are no effects.

The object, and the elements in the range [low,high), are accessed.

In below example explains about std::ctype::scan_not.

#include <iostream>
#include <locale>

int main () {
   std::locale loc;

   const char period[] = "june2018";

   const char * p = std::use_facet< std::ctype<char> >(loc).scan_not 
      ( std::ctype<char>::alpha, period, period+12 );

   std::cout << "The first non-alphabetic character is: " << *p << '\n';

   return 0;
}

Let us compile and run the above program, this will produce the following result −

The first non-alphabetic character is: 2

locale.htm

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