The following table shows the size or number of each item that the compiler can process. All capacities shown in the table are tested values; the actual number can be greater than the number shown.
| Item | Tested Values |
|---|---|
| Control structure nesting (block nesting) | 512 |
| Conditional compilation nesting | 512 |
| Declarator modifiers | 512 |
| Parenthesis nesting levels | 512 |
| Significant characters, internal identifier | 2048 |
| External identifier name length | 64K |
| Number of external identifiers/file | 128K |
| Number of identifiers in a single block | 2048 |
| Number of macros simultaneously defined | 128K |
| Number of parameters to a function call | 512 |
| Number of parameters per macro | 512 |
| Number of characters in a string | 128K |
| Bytes in an object | 512K |
| Include file nesting depth | 512 |
| Case labels in a switch | 32K |
| Members in one structure or union | 32K |
| Enumeration constants in one enumeration | 8192 |
| Levels of structure nesting | 320 |
| Size of arrays (IA-32 only) | 2 GB |