newenclave / eparser

Small expression parser

eparser. The expression parser.

Small expression parser.

a calculator example

see tests/calculator.cpp

Available operators

+, -, *, /, %, =, :=

= and :=

The operators bind values to names. Operator = creates a constant while := makes a variable that is evaluated any time it's in the expression.

Enter: a = 0
    (a = 0) = 0
Enter: b = 0
    (b = 0) = 0
Enter: c := a + b
    (c := (a + b)) = 0
Enter: a = 2
    (a = 2) = 2
Enter: b = 2
    (b = 2) = 2
Enter: c
    c = 4
Enter: b = 10
    (b = 10) = 10
Enter: c
    c = 12

Here a and b are constans and c is a variable.

Enter: 2 + 2 * 2
        (2 + (2 * 2)) = 6
Enter: (2 + 2) * 2
        ((2 + 2) * 2) = 8

a plot example

Same as the calculator, but you enter an expresstion with 'X' and the example draws all 'Y' values as a line.