Vision VTB-101 Uživatelská příručka stáhnout pdf (Strana 33)

VTB USER GUIDE

7 OPERATORS

The operators of VTB are common to other compilers.

7.1 Logic and Mathematical Operators

These are all the logic and mathematical operators available in VTB:

OPERATOR

DESCRIPTION

EXAMPLE

(

Parenthesis

It identifies the begin of a group of calculation or function a=(c+b)/(x+y)

fun(10,20)

Addition

Mathematical addition a=b+c

Subtraction

Mathematical subtraction a=b-c

Multiplication

Mathematical multiplication a=b*c

Division

Mathematical division a=b/c

)

Parenthesis

It identifies the end of a group of calculation or function a=(c+b)/(x+y)

fun(10,20)

Greater

Greater than condition if a>b

Less

Less than condition if a<b

Greater Equal

Greater or equal than condition if a>=b

Less Equal

Less or equal than condition if a<=b

Not equal

Not equal condition if a<>b

Equal

Equal condition if a=b or assignment a=b

Logic OR

OR logic condition if (a=b) || (b=c)

condition it's true if at least one expression is true

Logic AND

AND logic condition if (a=b) && (b=c)

condition it's true if both expressions are true

OR bit

Execute the OR between two value a=a|3

Bits 1 and 2 of variable a are set leaving unchanged the others

AND bit

Execute the AND between two value a=a&3

All bit of variable a are reset except the bits 1 and 2

Logic NOT

Negation of an expression if !(a<>b)

The expression is true if a is equal to b

NOT bit

Execute a not on all the bits of a value, all bits will change its state

a=85 a=~a

After NOT instruction the variable a will take the value 170

85 → 01010101

170 → 10101010

Shift to right

The bits of the variable are shifted to left n times

a=8 a=a>>3 After shift the variable a will take the value 1

Shift to left

The bits of the variable are shifted to right n times

a=1 a=a<<3 After shift the variable a will take the value 8

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 124 125

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