C++ towupper()

The towupper() function in C++ converts a given wide character to uppercase.

The towupper() function is defined in <cwctype> header file.

towupper() prototype

wint_t towupper( wint_t ch );

The towupper() function converts ch to its uppercase version if it exists. If the uppercase version of a wide character does not exist, it remains unmodified.

The lowercase letters from a to z is converted to uppercase letters from A to Z respectively.

towupper() Parameters

  • ch: The wide character to convert

towupper() Return value

  • The towupper() function returns a uppercase version of ch if it exists. Otherwise it returns ch.

Example: How towupper() function works?

#include <cwctype>
#include <cwchar>
#include <iostream>
#include <clocale>
using namespace std;

int main()
	setlocale(LC_ALL, "en_US.UTF-8");
	wchar_t str[] = L"Ĵōhn Deńvėr";
	wcout << L"The uppercase version of \"" << str << L"\" is ";
	for (int i=0; i<wcslen(str); i++)
	return 0;

When you run the program, the output will be:

The uppercase version of "Ĵōhn Deńvėr" is ĴŌHN DEŃVĖR
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