C library: ctype <ctype.h>

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The ctype library in C programming language provides functions that handle character values. With functions inside this C library, we can convert character values and identify their types. This C library is included with most C compilers.

Note: to use functions inside ctype library, we need to include the header file ctype.h into our program (#include <ctype.h>).

We can find 13 functions in this standard C library: