272 Chapter 7 BASIC Language for the 3458A
*
If the displacement is positive, rotating or shifting is toward the least significant
bit.
If the displacement is negative, rotating or shifting is toward the most significant
bit.
Math Hierarchy The 3458A evaluates parenthetical expressions before evaluating any math
functions outside of parentheses. If two or more operations of the same
priority are in the expression, the hierarchy is from left to right
.
Math Errors When evaluating a math expression, the following errors may occur. The
3458A treats math errors just like any other execution errors. Refer to chapter
3 for more information on handling errors.
Making Comparisons
Work
If you are making mathematical comparisons between integer numbers, no
special precautions are necessary. However, if you are comparing REAL
numbers, especially those which are the results of calculations, it is possible
that you might run into problems due to rounding and other limitations
inherent in the system. For example, consider the use of the IF...THEN
statement to check for equality in any situation resembling the following
example.
10 OUTPUT 722; "SUB TESTER"
ROTATE(X,displacement) Returns an integer obtained by rotating the argument a
specified number of positions with bit wraparound.*
SHIFT(X,displacement) Returns an integer obtained by rotating the argument a
specified number of positions without bit wraparound.*
Function/Argument Meaning
Highest Priority Parentheses
Functions: SIN, COS, etc.
Exponentiation
*, /, MOD, DIV
+, –
Lowest Priority Relational Operators: <, >, < =, >=, etc.
logical operators: AND, OR, etc.
Error Description
Division by Zero
Real Overflow
Real Underflow
Integer Overflow
Square Root of a Negative Number
Log of a Non-Positive Number
Illegal Real Number
Trig Argument Out of Range
BCD Exponent Too Big
HEX, Octal, or Decimal Argument Error
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