What is file modes ?

• Mode specifies the purpose of opening the file.
• Mainly mode divided into 3 types Read (r), Write (w), and Append (a).
• Read mode is used to opening the file for reading only.
• If the file is not exists in read mode, an error occurs.
• Write mode is used to opening the file for writing only.
• If the file is exists in write mode, all contents are deleted.
• Append mode is used to open the file for adding or appending data into the file.
• If the file is not exists in append mode, file is created.

File mode	Operation
r	Open the file reading only
w	Open the file writing only
a	Open the file for appending data
r+	Both reading and writing
w+	both reading and writing
a+	Both reading and writing

Ex:

FILE *fp1, *fp2, *fp3;

fp1 = fopen (“ file1 ”, ” r ”);

fp2 = fopen (“ file2 “, “ w “);

fp3 = fopen (“ file3 “, “ a “);