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

C++ Locale Library - islower

It checks if character is lowercase letter and other locales may consider a different selection of characters as lowercase characters, but never characters that returns true for iscntrl, isdigit, ispunct or isspace.

Following is the declaration for std::islower.

int islower ( int c );

int islower ( 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::islower.

#include <stdio.h>
#include <ctype.h>
int main () {
   int i=0;
   char str[]="Tutorials point india pvt ltd.\n";
   char c;
   while (str[i]) {
      c=str[i];
      if (islower(c)) c=toupper(c);
      putchar (c);
      i++;
   }
   return 0;
}

The sample output should be like this −

TUTORIALS POINT INDIA PVT LTD.

locale.htm

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