Programming Guide : 9. Using 3GL in Your Application : Technical Tips : 4GL/3GL Data Types
 
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4GL/3GL Data Types
The following table shows the types for 4GL and the corresponding 3GL types:
4GL
3GL on All Platforms
varchar
char*
char
char*
date
char*
money
double
float
double
smallint
int (4 bytes)
int
int
Note:  Addresses returned to OpenROAD from a 3GL procedure should be global or static so that they are not out of scope when used in the 4GL.