need add abs to the test cases
First N Perfect Squares
Set the array elements whose value is 13 to 0
matrix of natural number
Simple equation: Annual salary
Convert Fahrenheit to Celsius
Find Excess 3 code of given decimal number.
Find out value of sine given by degree.
Find out the Gray Code for a Given Binary Number
Find out phase angle of second order system.
Convert Decimal Number to Hex number (including non integer value)
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