December 22, 2000 TOWLOWER 3

### NAME

towlower - wide character case letter conversion utilities

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```wint_t` towlower(```wint_t wc`)
```wint_t` towupper(```wint_t wc`)

### DESCRIPTION

The towlower(``) function converts an upper-case wide character to the corresponding lower-case letter. The towupper(``) function converts an lower-case wide character to the corresponding upper-case letter.

### RETURN VALUES

If the argument is an upper/lower-case letter, the tolower(``) function returns the corresponding counterpart if there is one; otherwise the argument is returned unchanged.

### SEE ALSO

tolower(3), toupper(3)

### STANDARDS

The functions conform to ISO/IEC 9899:1999 (``ISO C99'') .