Answer Posted / sha

fopen("file1.txt","wb"); will open the file file1.txt in
binary read and write mode. Binary mode is useful to write
a file with 0s and 1s. For example, sometimes it would be
required to open a executable file. In that case, binary
mode is useful.
fopen("file1.txt","w"); will open the file1.txt in text
mode which means you can write regular letters and numbers
in that file.

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