_tolower
Go Up to ctype.h Index
Header File
ctype.h
Category
Conversion Routines
Prototype
int _tolower(int ch);
Description
_tolower is a macro that does the same conversion as tolower, except that it should be used only when ch is known to be uppercase (AZ).
To use _tolower, you must include ctype.h.
Return Value
_tolower returns the converted value of ch if it is uppercase; otherwise, the result is undefined.
Example
#include <string.h> #include <stdio.h> #include <ctype.h> int main(void) { int length, i; char *string = "THIS IS A STRING."; length = strlen(string); for (i = 0; i < length; i++) { if ((string[i] >= 'A') && (string[i] <= 'Z')){ string[i] = _tolower(string[i]); } } printf("%s\n",string); return 0; }
Portability
POSIX | Win32 | ANSI C | ANSI C++ |
---|---|---|---|
+ |