Question: C language program about the File function Write a program to open a file named test.dat, convert all lower-case letters in the file to the

C language program about the File function

Write a program to open a file named test.dat, convert all lower-case letters in the file to the corresponding upper-case ones, and convert all upper-case letters to the corresponding lower-case ones, and finally write the converted letters back to file test.dat. Suppose the file stores at most 100 letters.

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