Reading from file using fgets

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You need to check the return value of fgets. If a read has been successful, fgets returns the pointer to the buffer that you passed to it (i.e. string in your example). If the End-of-File is encountered and no characters have been read, fgets returns NULL.

Try this:

char string[100];
while(fgets(string, 100, fp)) {
    printf("%s\n", string);
}

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