Different file opening modes in C++ are as follows:
| Modes | Description |
| ios::in | Opens a file for reading. New contents cannot be written in the file. |
| ios::out | Opens a file for writing. If file exist already then its contents are deleted but if the file does not exist it will create a new file. |
| ios::binary | It opens a file in binary form. |
| ios::truncate | Opens a file for writing. If file already exists then its previous contents are replaced with the new contents. |
| ios::app | Opens a file in append mode. It adds new content at the end of the file. |
| ios::ate | It is used to write new contents at the end of the file and we can also modify the previous contents. |
| ios::nocreate | It does not allow to create a new file if it does not exist. |
| Ios::noreplace | It does replace the old file with new file. |
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very short and easy to understand.