With PentaCalc you have the option of working in three different word sizes: 8 bit, 16 bit, and 32 bit.  

PentaCalc limits the range of numbers you can use in your calculations, depending on the bit size you choose, and the status of the Sign check box.   

Octal and binary bases have similar limitations, but the decimal base does not. The decimal base ignores the word size and Sign checkbox because this base is used by all other calculators in addition to the programming calculator. You may still use the decimal base with the programming calculator, but if you enter a decimal number and then convert it to another base, it will truncate the number, if necessary, to fit into the current word size.