Dear Sudevan K.
This type of problem is a challenge for me that I accept with a smile.
I took your test cases, wrote and small program and the tests failed. I tried modifying the format of the test cases but they still failed. For a while, I thought that the testing system has some bugs, but After many tests, I rewrite from scratch your test and voila the tests worked as expected. At that moment I was astonished. I looked for hidden characters in your test code with no luck.
Finally, I realized that to represent the minus sign, you wrote a large hyphen from the UTF-8 charset (\342) instead of the common hyphen of the ASCII table with char code 45.
You can see that the hyphen near the 1.0 is a little bit larger than the hyphen near the 2.0
Please, use the common hyphen to represent the minus sign and the problem will vanish.
Best regards,
Juan Carlos.