Utility Functions and C Language Reference > C Language Reference > Character Classification and Conversion Functions

Character Classification and Conversion Functions

Character Classification and Conversion functions allow you to convert characters within a string. Expand the category to view a list of the available functions.

Click one of the following functions for more information:

Function Name
Description
Converts a string to lowercase.
Converts a string to uppercase.
Checks if a string is a decimal digit.
Checks if a string is a letter.