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toupper

From cppreference.com
< c‎ | string‎ | byte
Revision as of 06:45, 16 October 2013 by Eendy (Talk | contribs)

Defined in header <ctype.h>
int toupper( int ch );

Converts the given character to uppercase according to the character conversion rules defined by the currently installed C locale.

In the default "C" locale, the following uppercase letters abcdefghijklmnopqrstuvwxyz are replaced with respective lowercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ.

Contents

Parameters

ch - character to be converted

Return value

Uppercase version of ch or unmodified ch if no uppercase version is listed in the current C locale.

Example

#include <stdio.h>
#include <ctype.h>
#include <locale.h>
 
int main()
{
    char c = '\xb8'; // the character Ž in ISO-8859-15
                     // but ´ (acute accent) in ISO-8859-1 
    unsigned char c2 = c;   // for printing
    setlocale(LC_ALL, "en_US.iso88591");
    printf("in iso8859-1, toupper('0x%x') gives 0x%x\n", c2, toupper(c));
    setlocale(LC_ALL, "en_US.iso885915");
    printf("in iso8859-15, toupper('0x%x') gives 0x%x\n", c2, toupper(c));
}

Output:

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

See also

converts a character to lowercase
(function) [edit]
converts a wide character to uppercase
(function) [edit]
C++ documentation for toupper