r Mode	r+ Mode	w Mode	w+ Mode	a Mode	a+ Mode
Open the file for read mode only. File pointer places at beginning of the file. It never creates a new file if file doesn't exists & doesn't truncates content of the existed file.	Open the file for read and write mode.  File pointer places at beginning  of the file. It never creates a new file if file doesn't exists & doesn't truncates content of the existed file. .	Open the file for write mode.  File pointer places at beginning of the file. It creates a new file if file doesn't exists & truncates the content of file to 0 length.	Open the file for  read and write mode.  File pointer places at beginning of the file. It creates a new file if file doesn't exists & truncates the content of the file to 0 length.	Open the  file for  write mode only.  File pointer places at  ending of the file. It creates a new file if file doesn't exists & doesn't truncates existed file content  to 0 length.	Open the file for read and write mode.  File pointer places at ending of the file. It creates a new file if file doesn't exists & doesn't truncates existed file content  to 0 length.