Vtech PreComputer Power Pad Plus User Manual - Page 58

Graphics Function, Substrings

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VAL VAL works like STR$ but in reverse. It changes a string argument into a number. Look at the following short program. Example: 10 A$="33" 20 B$="20" 30 C=VAL(A$+B$) 40 D= VAL (A$) + VAL (B$) 50 PRINT C;D RUN 3320 53 GRAPHICS FUNCTION PGET function Returns the color attribute of a specified pixel. PGET(X, Y) = n n Returns 1 the current coordinates(X, Y) turns the pixel status ON 0 the current coordinates(X, Y) turns the pixel status OFF SUBSTRINGS It is also possible to get substrings of strings. A substring is a part of a string. For example: "ABC" is a substring of "ABCDE". The following three functions operate on substrings. LEFT$ (A$,N) This will return the substring from the left-most of string A$, the first character to the Nth character. 54

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54
VAL
VAL works like STR$ but in reverse.
It changes a string argument into a number.
Look
at the following short program.
Example:
10
A$=“33”
20
B$=“20”
30
C=VAL(A$+B$)
40
D= VAL (A$) + VAL (B$)
50
PRINT C;D
RUN
3320
53
GRAPHICS FUNCTION
PGET
function
Returns the color attribute of a specified pixel.
PGET(X, Y) = n
n
Returns
1
the current coordinates(X, Y) turns the pixel status ON
0
the current coordinates(X, Y) turns the pixel status OFF
SUBSTRINGS
It is also possible to get substrings of strings.
A substring is a part of a string.
For example:
“ABC” is a substring of “ABCDE”.
The following three functions operate on substrings.
LEFT$ (A$,N)
This will return the substring from the left-most of string A$, the first character to the Nth
character.