This article describes the formula syntax and usage of the ASC function in Microsoft Excel.
For Double-byte character set (DBCS) languages, the function changes full-width (double-byte) characters to half-width (single-byte) characters.
The ASC function syntax has the following arguments:
Text Required. The text or a reference to a cell that contains the text you want to change. If text does not contain any full-width letters, text is not changed.
=ASC("EXCEL") equals "EXCEL"
=ASC(" ") equals " "