Mega Code Archive

Using functions islower, isupper, tolower, toupper

#include <stdio.h> #include <ctype.h> int main() { printf( "%s\n%s%s\n%s%s\n%s%s\n%s%s\n\n", "According to islower:", islower( 'p' ) ? "p is a " : "p is not a ", "lowercase letter", islower( 'P' ) ? "P is a " : "P is not a ", "lowercase letter", islower( '5' ) ? "5 is a " : "5 is not a ", "lowercase letter", islower( '!' ) ? "! is a " : "! is not a ", "lowercase letter" ); printf( "%s\n%s%s\n%s%s\n%s%s\n%s%s\n\n", "According to isupper:", isupper( 'D' ) ? "D is an " : "D is not an ", "uppercase letter", isupper( 'd' ) ? "d is an " : "d is not an ", "uppercase letter", isupper( '8' ) ? "8 is an " : "8 is not an ", "uppercase letter", isupper( '$' ) ? "$ is an " : "$ is not an ", "uppercase letter" ); printf( "%s%c\n%s%c\n%s%c\n%s%c\n", "u converted to uppercase is ", toupper( 'u' ), "7 converted to uppercase is ", toupper( '7' ), "$ converted to uppercase is ", toupper( '$' ), "L converted to lowercase is ", tolower( 'L' ) ); return 0; } According to islower: p is a lowercase letter P is not a lowercase letter 5 is not a lowercase letter ! is not a lowercase letter According to isupper: D is an uppercase letter d is not an uppercase letter 8 is not an uppercase letter $ is not an uppercase letter u converted to uppercase is U 7 converted to uppercase is 7 $ converted to uppercase is $ L converted to lowercase is l