C examples for Reference:Language Reference
| Mode string | Description |
|---|---|
| "r" | Existing text file is opened for reading only. If specified text file doesn't exist then error is reported. |
| "rb" | Existing binary file is opened for reading only. If specified binary file doesn't exist then error is reported. |
| "rt" | Same as "r". |
| "r+" | Existing text file is opened for reading as well as writing. If specified text file doesn't exist then error is reported. |
| "r+b" | Existing binary file is opened for reading as well as writing. If specified binary file doesn't exist then error is reported. |
| "r+t" | Same as "r+". |
| "w" | Contents of specified text file are deleted and then it is opened for writing. If specified text file doesn't exist then it is created. |
| "wb" | Contents of specified binary file are deleted and then it is opened for writing. If specified binary file doesn't exist then it is created. |
| "wt" | Same as "w". |
| "w+" | Contents of specified text file are deleted and then it is opened for writing as well as reading. If specified text file doesn't exist then it is created. |
| "w+b" | Contents of specified binary file are deleted and then it is opened for writing as well as reading. If specified binary file doesn't exist then it is created. |
| "w+t" | Same as "w+". |
| "a" | Specified text file is opened for writing at the end of file (i.e., appending). If specified text file doesn't exist then it is created. |
| "ab" | Specified binary file is opened for writing at the end of file (i.e., appending). If specified binary file doesn't exist then it is created. |
| "at" | Same as mode "a". |
| "a+" | Specified text file is opened for reading as well as writing at the end of file (i.e., appending). If specified text file doesn't exist then it is created. |
| "a+b" | Specified binary file is opened for reading as well as writing at the end of file (i.e., appending). If specified binary file doesn't exist then it is created. |
| "a+t" | Same as "a+". |