Text File Modes in C
During programming text file can be opened for different purposes i.e. reading, writing or both. This is specified by using file modes. Different text file modes in C programming are tabulated below:
| Modes | Purpose |
|---|---|
| r | Open text file for reading only. The file must already exist. |
| w | Open text file for writing only. If the file specified already exists, its contents will be destroyed. If it does not exist it will be created. |
| a | Open text file for appending (i.e. adding data to the end of existing file). If it does not exist it will be created. |
| r+ | Open text file for both reading and writing. The file must already exist. |
| w+ | Open text file for both reading and writing. If the file exists, its content will be overwritten. If it does not exist it will be created. |
| a+ | Open text file for both reading and appending. If a file does not exist it will be created. |