The following table identifies the internal hexadecimal representation of operating system control sequences used by the ILE C/C++ compiler and library.
| Print representation | Internal representation |
|---|---|
| NUL (null) | 0x00 |
| SOH (start of heading) | 0x01 |
| STX (start of text) | 0x02 |
| ETX (end of text) | 0x03 |
| SEL (select) | 0x04 |
| HT (horizontal tab) | 0x05 |
| RNL (required new line) | 0x06 |
| DEL (delete) | 0x07 |
| GE (graphic escape) | 0x08 |
| SPS (superscript) | 0x09 |
| RPT (repeat) | 0x0a |
| VT (vertical tab) | 0x0b |
| FF (form feed) | 0x0c |
| CR (carriage return) | 0x0d |
| SO (shift out) | 0x0e |
| SI (shift in) | 0x0f |
| DLE (data link escape) | 0x10 |
| DC1 (device control 1) | 0x11 |
| DC2 (device control 2) | 0x12 |
| DC3 (device control 3) | 0x13 |
| RES/ENP (restore or enable presentation) | 0x14 |
| NL (new line) | 0x15 |
| BS (backspace) | 0x16 |
| POC (program-operator communication) | 0x17 |
| CAN (cancel) | 0x18 |
| EM (end of medium) | 0x19 |
| UBS (unit backspace) | 0x1a |
| CU1 (customer use 1) | 0x1b |
| IFS (interchange file separator) | 0x1c |
| IGS (interchange group separator) | 0x1d |
| IRS (interchange record separator) | 0x1e |
| IUS/ITB (interchange unit separator or intermediate transmission block) | 0x1f |
| DS (digit select) | 0x20 |
| SOS (start of significance) | 0x21 |
| FS (field separator) | 0x22 |
| WUS (word underscore) | 0x23 |
| BYP/INP (bypass or inhibit presentation) | 0x24 |
| LF (line feed) | 0x25 |
| ETB (end of transmission block) | 0x26 |
| ESC (escape) | 0x27 |
| SA (set attributes) | 0x28 |
| SM/SW (set mode or switch) | 0x2a |
| CSP (control sequence prefix) | 0x2b |
| MFA (modify field attribute) | 0x2c |
| ENQ (enquiry) | 0x2d |
| ACK (acknowledge) | 0x2e |
| BEL (bell) | 0x2f |
| SYN (synchronous idle) | 0x32 |
| IR (index return) | 0x33 |
| PP (presentation position) | 0x34 |
| TRN | 0x35 |
| NBS (numeric backspace) | 0x36 |
| EOT (end of transmission) | 0x37 |
| SBS (subscript) | 0x38 |
| IT (indent tab) | 0x39 |
| RFF (required form feed) | 0x3a |
| CU3 (customer use 3) | 0x3b |
| DC4 (device control 4) | 0x3c |
| NAK (negative acknowledge) | 0x3d |
| SUB (substitute) | 0x3f |
| (blank character) | 0x40 |