From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/c/string%2Fbyte%2Ftolower.html | 49 ++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 devdocs/c/string%2Fbyte%2Ftolower.html (limited to 'devdocs/c/string%2Fbyte%2Ftolower.html') diff --git a/devdocs/c/string%2Fbyte%2Ftolower.html b/devdocs/c/string%2Fbyte%2Ftolower.html new file mode 100644 index 00000000..5e9a1f90 --- /dev/null +++ b/devdocs/c/string%2Fbyte%2Ftolower.html @@ -0,0 +1,49 @@ +

tolower

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

Converts the given character to lowercase 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.

+

Parameters

+ +
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.

Return value

Lowercase version of ch or unmodified ch if no lowercase version is listed in the current C locale.

+

Example

#include <stdio.h>
+#include <ctype.h>
+#include <locale.h>
+#include <limits.h>
+ 
+int main(void)
+{
+    /* In the default locale: */
+    for (unsigned char u = 0; u < UCHAR_MAX; u++) {
+        unsigned char l = tolower(u);
+        if (l != u) printf("%c%c ", u, l);
+    }
+    printf("\n\n");
+ 
+    unsigned char c = '\xb4'; // the character Ž in ISO-8859-15
+                              // but ´ (acute accent) in ISO-8859-1
+    setlocale(LC_ALL, "en_US.iso88591");
+    printf("in iso8859-1, tolower('0x%x') gives 0x%x\n", c, tolower(c));
+    setlocale(LC_ALL, "en_US.iso885915");
+    printf("in iso8859-15, tolower('0x%x') gives 0x%x\n", c, tolower(c));
+}

Possible 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, tolower('0xb4') gives 0xb4
+in iso8859-15, tolower('0xb4') gives 0xb8

References

See also

+ + +
converts a character to uppercase
(function)
+
(C95)
 converts a wide character to lowercase
(function)
C++ documentation for tolower
+

+ © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/string/byte/tolower +

+
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