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C program to read strings from a file and uppercase them

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I need some guidance writing a program in C code that reads a lowercase string of characters from a text file named "data.txt", then duplicates the string in uppercase characters and displays both, the original lowercase and uppercase strings.

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Solution Summary

The expert examines an attached program code makes use of 'fgets' library function.

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Please go through the attached program code (411967.c) and follow the program flow with the help of comments inserted there.

Before compiling the program, adjust the value of MAXLINESIZE macro in the code and ensure that the input file "data.txt" is in ...

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