FIX

This operation enables the fixed format for real numbers on the calculator. The fixed format takes a real argument which is the number of digits to display to the right of the decimal point. When enabled, there will always be that many digits shown to the right of the decimal place, even if they are all 0's. If more than 12 digits are required to represent the number, then the number will be shown in exponential format. Similarly, if the number is too small to be represented at all in the number of decimal digits specified, it will be shown in exponential format.