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| Character manipulation | |||||||||||||||||||||||||||||||||||||||||
| Conversions to and from numeric formats | |||||||||||||||||||||||||||||||||||||||||
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| String manipulation | |||||||||||||||||||||||||||||||||||||||||
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| String examination | |||||||||||||||||||||||||||||||||||||||||
| Memory manipulation | |||||||||||||||||||||||||||||||||||||||||
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| Miscellaneous | |||||||||||||||||||||||||||||||||||||||||
(C11)(C11) | |||||||||||||||||||||||||||||||||||||||||
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 lettersABCDEFGHIJKLMNOPQRSTUVWXYZ are replaced with respective lowercase lettersabcdefghijklmnopqrstuvwxyz.
Contents |
| ch | - | character to be converted. If the value ofch is not representable asunsignedchar and does not equalEOF, the behavior is undefined. |
Lowercase version ofch or unmodifiedch if no lowercase version is listed in the current C locale.
#include <ctype.h>#include <limits.h>#include <locale.h>#include <stdio.h> int main(void){// In the default localefor(unsignedchar u=0; u<UCHAR_MAX; u++){unsignedchar l= tolower(u);if(l!= u)printf("%c%c ", u, l);}printf("\n\n"); unsignedchar c='\xb4';// the character Ž in ISO-8859-15// but ´ (acute accent) in ISO-8859-1setlocale(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 0xb4in iso8859-15, tolower('0xb4') gives 0xb8| converts a character to uppercase (function)[edit] | |
(C95) | converts a wide character to lowercase (function)[edit] |
C++ documentation fortolower | |
