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5Ć3
BASIC evaluates expressions enclosed in parentheses before the
operator immediately outside the parentheses, even when the
operator enclosed in parentheses is on a lower precedence level
than the operator outside the parentheses. In the statement A = B*
(C - D), BASIC evaluates the (C - D) first, and then multiplies B by
the result of (C - D).
BASIC will still evaluate other expressions before those in
parentheses if the other expressions come first in the statement and
have a higher precedence. In the statement below, however, the
parenthetical expression occurs later in the overall expression. The
exponentiation operation is performed first (before the parentheses)
because it is encountered first in the leftĆtoĆright evaluation and, at
the time it is encountered, is a higher precedence than any operator
before it.
BASIC evaluates the expression A = B - C**5 + (X*(Z - 17)), in
the following sequence:
C% Exponentiation
B - C
% Subtraction with first term
Z - 17
Innermost parenthetical expression
X * (Z - 17)
Next level of parentheses
[B - C
%
] + [X*(Z - 17)]
Combination of the two expressions
Arithmetic mixing of both single and double precision integers along
with real variables and constants is permitted in a BASIC statement.
The rules regarding truncation and the maximum size integerĆtoĆreal
conversion still apply.
The following are valid arithmetic mixing examples:
20 GAIN = MOTOR_SPEED%*(OLDGAIN!*13.8876)
or
20 GAIN! = GAIN! + REFERENCE%
The following example could cause an overflow if the resultant value
is larger than 16 bits of precision. In such a case, the largest
possible single positive or negative integer would be loaded into the
variable GAIN%. The program would continue to run, and an error
would be logged to notify the user of the problem.
20 GAIN% = REFERENCE! + GAIN%
BASIC provides three operations for use with string expressions.
These are the assignment operation (=), the concatenation
(addition of strings) operation (+), and the equality/inequality
comparison operations (=, < >, or > < ).
By using the assignment operator, you can equate or assign one
string variable or constant to another string variable. In the
statement below, the character sequence THIS IS A MESSAGE" is
assigned to the string variable C$:
C$ = THIS IS A MES
SAGE"
The concatenation operator (+) combines string variables and
constants to form a new string expression:
C$ = HI" + B$ + D$ + STRING"
- r 1
- 1
- 1
- 1
- 1
- Table of Contents 3
- 6
- 7
- 1.0 INTRODUCTION 9
- 10
- 2.0 PROGRAMMING FOR 13
- AutoMax SYSTEMS 13
- 14
- 3.0 STRUCTURE OF AN 17
- AutoMax ENHANCED BASIC 17
- 18
- 19
- 4.0 VARIABLES AND 21
- CONSTANTS 21
- 26
- 28
- 29
- 30
- 30
- 31
- 5.0 EXPRESSIONS 33
- 35
- 36
- 5.4 Relational Expressions 38
- 39
- 6.0 AutoMax ENHANCED BASIC 41
- STATEMENT TYPES 41
- 43
- 43
- 44
- 6.3 Variable Assignment 46
- (LET/SET_MAGNITUDE) 46
- 6.4.1 GOTO (GO TO) Statement 47
- 49
- (Subroutines) 50
- 52
- 52
- 53
- 57
- 57
- 59
- 59
- 60
- 60
- 6.7 Real Time Enhancements 62
- 63
- 63
- 6.8.1 OPEN 64
- Statement 64
- 1514131211109 87 6543210 67
- FOR INPUT STATEMENTS 67
- 6.8.2 CLOSE 73
- 6.8.3 INPUT 73
- 6.8.4 PRINT/PRINT 75
- USING Statements 75
- 82
- 82
- 82
- 83
- 83
- 83
- 84
- 6.9 Error Handling 85
- 6.10 INCLUDE Statement 86
- 6.11 Stopping Execution 87
- (STOP and END Statements) 87
- 89
- 90
- 90
- 90
- 90
- 7.5 LN Function 91
- 7.6 EXP (e**x) Function 91
- 7.7 SQRT Function 91
- 7.8 ABS Function 91
- 7.9 CHR$ Function 91
- 92
- 92
- 92
- 7.13 BINARY$ Function 93
- 7.14 HEX$ Function 93
- 7.15 LEFT$ Function 93
- 7.16 RIGHT$ Function 94
- 7.17 MID$ Function 94
- 7.18 VAL% Function 94
- 7.19 VAL Function 95
- 7.20 FIX Function 95
- 7.21 CURPOS$ Function 95
- 96
- 96
- 97
- 7.25 BIT_SET@ Function 98
- 7.26 BIT_CLR@ Function 98
- 7.27 BIT_MODIFY@ Function 98
- 99
- 100
- 100
- 7.32 BCD_OUT% Function 101
- 7.33 BCD_IN% Function 101
- 7.31 ROTATER% Function 101
- 102
- 7.35 GATEWAY_CMD_OK@ Function 103
- 104
- 7.37 TEST_ERRLOG@ Function 105
- 7.38 READVAR% Function 105
- 106
- 7.40 FINDVAR! Function 107
- 7.41 CONVERT% Function 107
- 7.42 RTS_CONTROL@ Function 108
- 109
- 109
- 8.0 ETHERNET 111
- COMMUNICATION 111
- FUNCTIONS 111
- 8.2 SOCKET% Function 112
- 8.3 BIND% Function 112
- 113
- 114
- 115
- 116
- 117
- 118
- 8.10 SETSOCKOPT% Function 119
- 8.11 GETSOCKOPT% Function 120
- 8.12 SHUTDOWN% Function 121
- Appendix A 123
- Appendix B 125
- 126
- 127
- 127
- 127
- AIT, DELAY, EVENT Error Codes 128
- Channel I/O Error Codes 128
- Array Error Codes 128
- 131
- 132
- 135
- 136
- 136
- 136
- Appendix C 137
- 139
- 141
- Appendix F 143
- For additional information 146
- 1 Allen-Bradley Drive 146
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