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Characters and ASCII

Get started0/320 / 32 required exercisesRecommended

Structure your code0/250 / 25 required exercisesAhead

Text0/290 / 29 required exercisesAhead

Characters and ASCII Strings: walking and searching Writing text without overflowing Words and tokens Transforming text Numbers and bases

Memory0/150 / 15 required exercisesAhead

Your own types0/190 / 19 required exercisesAhead

The machine0/180 / 18 required exercisesAhead

The system0/40 / 4 required exercisesAhead

Learning C
Text
Characters and ASCII

Characters and ASCII

Before text becomes text, it is just numbers wearing ASCII name tags.

Classify a byte from its numeric value alone
Convert case without a lookup table

7 exercisesDifficulty 2 to 284 XP availableView in graph

Required exercises

4 exercises

isalpha

int isalpha(int c)

isdigit

int isdigit(int c)

isspace

int isspace(int c)

toupper

int toupper(int c)

Extra practice

3 exercises

isalnum

int isalnum(int c)

isprint

int isprint(int c)

tolower

int tolower(int c)

Back to Text Next moduleStrings: walking and searching