It checks if character is uppercase letter and other locales may consider a different selection of characters as uppercase characters, but never characters that returns true for iscntrl, isdigit, ispunct or isspace..
DeclarationFollowing is the declaration for std::isupper.
C++98int isupper ( int c );C++11
int isupper ( int c );Parameters
c − Character to be checked, casted to an int, or EOF.
Return ValueIt returns a value different from zero.
ExceptionsNo-throw guarantee − this function never throws exceptions.
ExampleIn below example for std::isupper.
#include <stdio.h> #include <ctype.h> int main () { int i=0; char str[]="Tutorialspoint india pvt ltd.\n"; char c; while (str[i]) { c=str[i]; if (isupper(c)) c=tolower(c); putchar (c); i++; } return 0; }
The sample output should be like this −
tutorialspoint india pvt ltd.
locale.htm
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