Tolower (converts uppercase letters to lowercase letters)

/* Tolower (converts uppercase letters to lowercase letters) function isalpha, toupper header file # include <stdlib. h> defines the int tolower (INT c) function. It indicates that if the parameter C is an upper-case letter, the corresponding lower-case letter is returned. Return the converted lowercase letter. If no conversion is required, the C value is returned. Additional instructions example * // * converts uppercase letters in the S string to lowercase letters */# include <ctype. h> main () {char s [] = "abcdefgh12345 ;! # $ "; Int I; printf (" before tolower (): % s \ n ", S); for (I = 0; I <sizeof (s ); I ++) s [I] = tolower (s [I]); printf ("after tolower (): % s \ n", S );} /* execute before tolower (): abcdefgh12345 ;! # $ After tolower (): abcdefgh12345 ;! # $ */

 

Tolower (converts uppercase letters to lowercase letters)