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From your last post it sounds like you have used printf before without needing to adjust the compiler/linker settings. But the error message is definitely coming from the linker, it is unable to find something you're using in your code in the external libraries.
Is it possible that you have spelled something incorrectly and the reason that the linker is complaining is because it cannot find the incorrectly-spelled thing in the external library?
I'm afraid I can only suggest going through your code with a fine-toothed comb and check everything. Another useful technique is to make a copy of your program and try to reduce it to the smallest number of lines that still cause the error. This can sometimes help figure out what is causing the error.
Are any of your classmates having the same problem?
-- FF
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