std::toupper – cppreference.com

std::toupper

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definiert in Header <cctype>
int toupper( int ch );
Konvertiert den angegebenen Charakter nach den Zeichenkonvertierung Regeln der aktuell installierten C Gebietsschema definiert Großbuchstaben .
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Converts the given character to uppercase according to the character conversion rules defined by the currently installed C locale.
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Parameter

ch -
Zeichen umgewandelt werden
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character to be converted
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Rückgabewert

Umgerechnet Zeichen oder ch wenn keine Großbuchstaben Version von der aktuellen C locale definiert ist .
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Converted character or ch if no uppercase version is defined by the current C locale.
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Beispiel

#include <iostream>
#include <cctype>
#include <clocale>

int main()
{
    char c = '\xb8'; // the character ž in ISO-8859-15
                     // but ¸ (cedilla) in ISO-8859-1 

    std::setlocale(LC_ALL, "en_US.iso88591");
    std::cout << std::hex << std::showbase;
    std::cout << "in iso8859-1, toupper('0xb8') gives " << std::toupper(c) << '\n';
    std::setlocale(LC_ALL, "en_US.iso885915");
    std::cout << "in iso8859-15, toupper('0xb8') gives " << std::toupper(c) << '\n';
}

Output: 

in iso8859-1, toupper('0xb8') gives 0xb8
in iso8859-15, toupper('0xb8') gives 0xb4

Siehe auch