| Type |  | Name |  | Summary | 
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| Type |  | Cardinal |  | The basic unsigned integer type | 
| Keyword |  | Case |  | A mechanism for acting upon different values of an Ordinal | 
| Function |  | CelsiusToFahrenheit |  | Convert a celsius temperature into fahrenheit | 
| Function |  | ChangeFileExt |  | Change the extension part of a file name | 
| Type |  | Char |  | Variable type holding a single character | 
| Procedure |  | ChDir |  | Change the working drive plus path for a specified drive | 
| Function |  | Chr |  | Convert an integer into a character | 
| Keyword |  | Class |  | Starts the declaration of a type of object class | 
| Procedure |  | Close |  | Closes an open file | 
| Procedure |  | CloseFile |  | Closes an open file | 
| Variable |  | CmdLine |  | Holds the execution text used to start the current program | 
| Type |  | Comp |  | A 64 bit signed integer | 
| Function |  | CompareStr |  | Compare two strings to see which is greater than the other | 
| Function |  | CompareText |  | Compare two strings for equality, ignoring case | 
| Function |  | CompareValue |  | Compare numeric values with a tolerance | 
| Function |  | Concat |  | Concatenates one or more strings into one string | 
| Keyword |  | Const |  | Starts the definition of fixed data values | 
| Keyword |  | Constructor |  | Defines the method used to create an object from a class | 
| Procedure |  | Continue |  | Forces a jump to the next iteration of a loop | 
| Function |  | Convert |  | Convert one measurement value to another | 
| Function |  | Copy |  | Create a copy of part of  a string or an array | 
| Function |  | Cos |  | The Cosine of a number | 
| Function |  | CreateDir |  | Create a directory | 
| Type |  | Currency |  | A floating point type with 4 decimals used for financial values | 
| Variable |  | CurrencyDecimals |  | Defines decimal digit count in the Format function | 
| Variable |  | CurrencyFormat |  | Defines currency string placement in curr display functions | 
| Variable |  | CurrencyString |  | The currency string used in currency display functions | 
| Function |  | CurrToStr |  | Convert a currency value to a string | 
| Function |  | CurrToStrF |  | Convert a currency value to a string with formatting | 
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