Programmable Postfix Calculator v3.5
by Yama Habib
Usage: To use, run the executable, and at the prompt, either enter a postfix calculation using any of the available operations (listed below), or type "func" to enter function programming mode. The prompt will appear as follows:
Input function letter (i.e. F for F(x)):
Input any letter (A-Z) in uppercase to label the function (note that P and E are by default programmed to the functions P(x) = pi*x and E(x) = e^x, respectively. After entering a label, the following prompt will appear:
Input number of variables (1-3):
Input the number of dependent variables (i.e. the equation for a two dimensional parabola has one dependent variable, F(x) = x^2). The variables used will be x, y, and z. After choosing the number of variables, the equation should be entered in postfix notation (i.e. Positive Quadratic Formula: Q(x,y,z) = -y y 2 p 4 x * z * - 2 r + 2 x * /).
To call the function, simply reference it in the middle of a calculation as shown:
>> -1 Q(1,5,7) *
One can also graph a defined (single-variable) function by typing "graph" to enter graphing mode. A prompt will appear as follows:
Input function letter (i.e. F for F(x)):
Input the function letter of the function you want to graph. After doing this, another two prompts will appear as follows:
min x value:
max x value:
These are the minimum and maximum labels along the x axis of the graph. The y axis will be auto-scaled to the bounds of the graph. For instance, if you want to graph a function between -100 and 100, x min would be -100 and x max would be 100.
Supported Arithmetic Operations:
Addition [+]:
Traditional: 1 + 2
Postfix: 1 2 +
Ans: 3
Subtraction [-]:
Traditional: 3 - 2
Postfix: 3 2 -
Ans: 1
Multiplication [*]:
Traditional: 2 * 3
Postfix: 2 3 *
Ans: 6
Division [/]:
Traditional: 6 / 2
Postfix: 6 2 /
Ans: 3
Exponents [p]:
Traditional: 2^3
Postfix: 2 3 p
Ans: 8
Roots [r]:
Traditional: sqrt(9)
Postfix: 9 2 r
Ans: 3
Scientific Notation [e]:
Traditional: 2.1 * 10^3
Postfix: 2.1 3 e
Ans: 2100
Modulus (remainder) [%]:
Traditional: 5 % 2
Postfix: 5 2 %
Ans: 1
Logarithms [l]:
Traditional: log3(9), ln(1)
Postfix: 9 3 l, 1 E(1) l
Ans: 2, 0
Factorials [!]:
Traditional: 5!
Postfix: 5 !
Ans: 120
Absolute value [|]:
Traditional: |-1|
Postfix: -1 |
Ans: 1
Ceiling Function [c]:
Traditional: ceil(1.2)
Postfix: 1.2 c
Ans: 2
Floor Function [f]:
Traditional: floor(1.7)
Postfix: 1.7 f
Ans: 1
Previous Result [n]:
Traditional: 1 + 2 --> n + 3
Postfix: 1 2 + --> n 3 +
Ans: 6
Pi [P(x) = pi*x]:
Ex: P(1) 1 +
Ans: 4.14159...
e [E(x) = e^x]:
Ex: E(1) 1 +
Ans: 3.71828...
Trigonometric Functions:
Sine (radians): sin
Ex: P(1) sin
Ans: 0
Cosine (radians): cos
Ex: P(1) cos
Ans: -1
Tangent (radians): tan
Ex: P(0.25) tan
Ans: 1
Arcsin (radians): asin
Ex: 1 asin
Ans: 1.57... (pi/2)
Arccos (radians): acos
Ex: -1 acos
Ans: 3.14... (pi)
Arctan (radians): atan
Ex: 1 atan
Ans: 0.785... (pi/4)
Sine (degrees): sind
Ex: 180 sind
Ans: 0
Cosine (degrees): cosd
Ex: 180 cosd
Ans: -1
Tangent (degrees): tand
Ex: 45 tand
Ans: 1
Arcsin (degrees): asind
Ex: 1 asind
Ans: 90
Arccos (degrees): acosd
Ex: -1 acosd
Ans: 180
Arctan (degrees): atand
Ex: 1 atand
Ans: 45
To convert a value to a fraction: type "frac" at the prompt to convert the previous value to a fraction.
Warning: Using the arrow keys will irreversably interfere with the current operation and may lead to an incorrect result.
