1. Modify the fraction calculator application so that calculations can be chained. For example, allow for the following operation to be keyed: 1/5 + 2/7 – 3/8 2. You can add an icon to your...

1. Modify the fraction calculator application so that calculations can be chained. For example, allow for the following operation to be keyed: 1/5 + 2/7 – 3/8

2. You can add an icon to your application that will appear on the iPhone’s home screen.This can be done by dragging it to the App Icons section as shown in Figure 21.6. For a normal-sized icon (iPhone 3GS and earlier), the icon size should be 57x57 pixels large. For a Retina display iPhone (iPhone 4 and later), the icon image file should be 114x114 pixels. Find a suitable calculator image on the Internet that you can use and set up the fraction calculator to use this image as its application icon.