Please see the code bits someone explain me the second line comment. Reading the input file till there is input

Question

    // Condition check

            // Reading the input file till there is input

            // present

            while ((c = fis.read()) != -1) {
Why the c = fis.read()) should not be equal to -1.
Thank you

Answer 1

stephen haokip ,

-1 is returned when the end of the file is reached.