## Appendix D – The Calculator The ZX Spectrum Next can be used as a full function calculator. ### Selecting the calculator To use the calculator, call up the *Startup Menu* with **EDIT** and select the *Calculator* option. (If you don't know how to select a menu option, refer back to *Quick Start.)* The calculator may be selected as soon as the ZX Spectrum Next is switched on. Alternatively, if you are working on a *NextBASIC* program, you may select the calculator by choosing the *Exit* option from the *Edit/Options Menu* (which returns you to the *Startup Menu*), at which point you can select the *Calculator* option. Note that any *NextBASIC* program which was being worked on (when you selected the calculator) will be remembered and restored when you exit from the calculator and return to *NextBASIC*. ### Entering numbers When you have selected the *Calculator* option, the screen will change to:  ``` Calculator ``` *Fig. 54 – Calculator Screen* and the ZX Spectrum Next's calculator is ready to accept your first entry. Type in: ``` 6+4 ``` As soon as you press **ENTER**, the answer **10** will appear on the next line. (Note that you don't type = as you would on a conventional calculator.) ### Running total You will see that the cursor is positioned to the right of the answer, which is a *running total* (like on a conventional calculator). This means that you can simply type in the next operation to be carried out on the running total (without having to type in a whole new calculation). So, with the cursor still positioned to the right of the **10** on the screen, type in: ``` /5 ``` and the answer **2** appears.