Sharp MZ-800 - Page 180

GET 10 GETN Inputs one numerical character from the keyboard relative to numeri-
cal variable N. If the key is not pressed at that time, 0 is input.
20 GET K$ Inputs one string from the keyboard relative to string variable KS. If
the key is not pressed at that time, AS becomes vacant.
READ ~DATA 10 READ A,B,C Numerical data 25, —0.5 and 500 are substituted to, respectively, nu-
1010 DATA 25, merical variables A, B and C by execution of the READ-DATA
—0.5, 500 statements at the left.
10 READ H$,H, The first data of the DATA statement, i.e., string data “HEART”,
S$$,S is substituted for the first variable of the READ statement, i.e., for
30 DATA the string variable H$. Next, numerical data 3 is substituted for the
“HEART, 3 second variable H, and read-in continues one after the other.
35 DATA
“SPADE”, 11
RESTORE 10 READ A,B,C In the example at the left, 3, 6 and 9 are respectively substituted for
20 RESTORE variables A, B and C by the READ statement in statement number
30 READ D,E 10, but, because the RESTORE statement occurs next, the values
100 DATA 3, 6, next substituted for variables D and E by statement number 30's
9, 12, 15 READ are, respectively, 3 and 6, not 12 and 15.
700 RESTORE Moves the data read-out pointer in the READ-DATA statement to
200 the heading of the DATA statement in statement number 200,
Loop statements
FOR ~ NEXT
10 FOR A=1 TO
10
20 PRINT A
30 NEXT A
The statement number 10 is a command to change variable A and
substitute for values from | to 10; the value of the first A becomes
1. Because the value of A is displayed on the CRT screen by state-
ment number 20, the numeral 1 is displayed. Next, the value of A be-
comes 2 by statement number 30, and this loop is repeated. The loop
is repeated in this way until the value of A becomes 10. (At the point
when the loop ends, the value 11 is entered to A.)
10 FOR B = 2TO
8 STEP 3
20 PRINT B
30 NEXT B
A command to change variable B and substitute for values from 2 to
8 in steps of 3 (statement number 10). It is also possible to make the
STEP value negative and make the variable smaller each time.
1OFOR A=1 TO 3
20 FOR B=10T0 230 0|>
30 PRINT A, B g
40 NEXT B.
50 NEXT A
An example of an overlay of the FOR~ NEXT loops (variables A
and B). Note that B loop is placed inside A loop. Nesting of loops
(doubling, tripling ...) is possible, but the inner loop must be en-
closed within the outer loop. FOR ~ NEXT nesting must not exceed
15 levels.
9-5