(Just press **ENTER** each time it stops.) When **This is line 2.** is printed, the lower part of the screen moves up to make room for it; but the numbering moves up as well, so that the rows of text keep their same numbers. Now try this (again on *Layer 0*): ``` 10 FOR n=0 TO 19: PRINT AT n,0;n;: NEXT n 20 INPUT AT 0,0;a$; AT 1,0;a$; AT 2,0;a$; AT 3,0;a$; AT 4,0;a$; AT 5,0;a$; ``` As the lower part of the screen scrolls up and up, the upper part is undisturbed until the lower part threatens to write on the same line as the **PRINT** position. Then the upper part starts scrolling up to avoid this. The other *layers* work in the same manner as described for *PRINT items*, that is in both rigid (cell matrix) and flexible (pixel coordinate) terms. To illustrate the difference, issue a **LAYER 1,1** direct command and then modify the first example by first copying line **10** to line **20** and then changing all **AT** statements to **POINT** statements switching the x and y positions around, thus making the latter two parameters **0,16** and **0,8** respectively to reflect the height of characters (remember that on *layers* other than 0 character matrices will change according to character size and pixel positioning according to max resolution). The first thing you'll notice is that **INPUT** takes place at the top left of the screen as would with **PRINT** and the second one that the first *INPUT item* is NOT printed at "line" 1 but rather at "line" 0. Finally you can see from the modified first example that **INPUT** accepts a **POINT** modifier for positioning exactly like **PRINT** does. ### LINE input Another refinement to the **INPUT** statement that we haven't seen yet is called **LINE** input and is a different way of inputting string variables. If you write **LINE** before the name of a string variable to be input, as in: ``` INPUT LINE a$ ``` then the computer will *not* give you the string quotes that it normally does for a string variable, although it will pretend to itself that they are there. So if you type in: ``` Simon ``` as the **INPUT** data, **a$** will be given the value **Simon**. Because the string quotes do not appear on the string, you cannot delete them and type in a different sort of string expression for the **INPUT** data. Remember that you cannot use **LINE** for numeric variables. ### Using Expressions for INPUT There's an interesting capability of **INPUT**. While typing into an **INPUT** request that's expecting a number variable, you can use numeric expressions which can include previously defined variables. Try running this program: ``` 10 a=14 20 INPUT numbers 30 PRINT numbers 40 GO TO 20 ``` Input a few numbers, and they'll be printed as expected on the screen. Now type **a** and if you press **ENTER**, then **14** will appear! Try typing **a+2** and **16** will appear. However, if you