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

C++ Locale Library - isblank

It checks if character is blank and a blank character is a space character used to separate words within a line of text.

Following is the declaration for std::isblank.

int isblank ( int c );

int isblank ( 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::isblank.

#include <stdio.h>
#include <ctype.h>
int main () {
   char c;
   int i=0;
   char str[]="Sairam krishna mmammahe\n";
   while (str[i]) {
      c=str[i];
      if (isblank(c)) c='\n';
      putchar (c);
      i++;
   }
   return 0;
}

The sample output should be like this −

Sairam
krishna
mmammahe

locale.htm

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