Hello all What is the best code to use to test whether a text field contains any value? I've current got the following and its working, albeit I'm not sure if there is a better way: Code: if (purchasePrice.text==nil || purchasePrice.text.length==0) Furthermore, if it does contain a value what is the best way to test to see if it is numeric? Finally, and this is a question that is unrelated to the title but I just want to slip it in as well; I have the following statement to assign a Yes value to a boolean variable I have declared. After building my programme I have a warning against it which reads "Assignment makes pointer from integer without a cast": Code: errorFound=YES; Does it have something to do with YES being the same as a 1 and NO being the same as 0? Thanks for any assistance.