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 lowercase letters abcdefghijklmnopqrstuvwxyz are replaced with respective uppercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ.
| ch | - | character to be converted. If the value of ch is not representable as unsigned char and does not equal EOF, the behavior is undefined. |
Uppercase version of ch or unmodified ch if no uppercase version is listed in the current C locale.
#include <stdio.h>
#include <ctype.h>
#include <locale.h>
#include <limits.h>
int main(void)
{
/* In the default locale: */
unsigned char u;
for (unsigned char l=0; l<UCHAR_MAX; l++) {
u = toupper(l);
if (l!=u) printf("%c%c ", l,u);
}
printf("\n\n");
unsigned 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:
aA bB cC dD eE fF gG hH iI jJ kK lL mM nN oO pP qQ rR sS tT uU vV wW xX yY zZ
in iso8859-1, toupper('0xb8') gives 0xb8
in iso8859-15, toupper('0xb8') gives 0xb4| converts a character to lowercase (function) |
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(C95) | converts a wide character to uppercase (function) |
C++ documentation for toupper |
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