What you are doing there is multiplying something by a power of two, and 'ar' should have the value 1 for 'sr' to be set to two to the power of 10. Multiplying

What you are doing there is multiplying something by a power of two, and 'ar' should have the value 1 for 'sr' to be set to two to the power of 10. Multiplying by a power of 2 is easily done in C using the shift operator.