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Thank you for your help, and I understand that now but my output file is still blank after I run the program!

so I should change it to
ch=encode(ch, key);
fprintf(file_out, "%c", ch);
I've only covered pointers in files to move from line to line, so i'm not sure about the other way

is there any chance you could write some code to replace it with? I see the errors, i'm just not sure how to fix them!

I need to write a program that asks the user for the text file, prints its contents, then asks for the output file, encrypts the contents of the first file with caeser cipher and writes the...