This project contains a command line expression calculator. The application reads one line at a time from the command line and prints a result. The main function is Eval(). Eval() takes the math expression and does three operations: Tokenize(), Parse() and Visit(). Use Copy and Paste (Ctrl-C and Shift-Insert) on the command line as needed.
The is a C# Console-Mode Project. Open with Visual Studio 2022 and above to compile.
Command-Line Calculator. Calculate one math expression per line.
Shell
MathOne
Input File
MathOne [inFile]
Input File is optional.
Enter an empty line.
Unit Tests are included.
| Operator | Description | Example |
|---|---|---|
| + | Add | 1 + 2 |
| - | Subtract | 5 - 2 |
| * | Multiply | 2 * 7 |
| / | Divide | 30 / 3 |
| % | Modulus | 15 % 3 |
| ^ | Power, a ^ b | 3 ^ 2 |
| @ | Negate | -5 |
| A | Asolute Value | A(-5) |
| ACOS | Anti-Cosine | ACOS(0.3) |
| ASIN | Anti-Sine | ASIN(0.4) |
| ATAN | Anti-Tangent | ATAN(0.5) |
| CB | Cube, a ^ 3 | CB(5) |
| CDF | Cumulative Density Function | CDF(0.5) |
| CL | Ceiling | CL(7.25) |
| COS | Cosine in radians | COS(0.6) |
| CR | Cube root, EXP(a, 1 / 3) | CR(15) |
| DEG | Radians To Degrees | DEG(45) |
| EN | Euler's Number 2.71 | EN |
| F | Fraction | F(2.34) |
| FAC | Factorial | FAC(5) |
| FL | Floor | FL(7.63) |
| GAU | Gauss Distribution | GAU(0.5) |
| GCF | Greatest Common Factor | GCF(3, 21) |
| I | Integer | I(72.34) |
| LCM | Least Common Multiple | LCM(5, 125) |
| LG | Base 10 Logarithm, 10 ^ a | LG(25) |
| LN | Natural Logarithm, e ^ a | LN(35) |
| NCR | Combinations | NCR(6, 2) |
| ND | Normal Disribution | ND(0.25, 0, 1) |
| NPR | Permutations | NPR(6, 2) |
| P2 | Power of two, 2 ^ a | P2(6) |
| PD | Prime Divisor | PD(55555) |
| PHI | Cumulative Density Function | PHI(0.5) |
| PI | Half rotation in radians 3.14 | PI |
| R | Reciprocal, 1 / x | R(16.25) |
| RAD | Degrees To Radians | RAD(0.785) |
| RAN | Random Integer | RAN |
| RD | Round | RD(3.34) |
| RND | Random Double Between One and Zero | RND |
| RT | Nth Root, EXP(a, 1 / b) | RT(38, 4) |
| S | Change Sign | S(-5) |
| SIN | Sine in radians | SIN(0.83) |
| SR | Square Root, SQRT(a) | SR(25) |
| STU | Student T-Distribution | STU(1, 10) |
| TAN | Tangent in radians | TAN(0.35) |
| TAU | Full rotation in radians 6.28 | TAU |
| X2 | Square, a * a | X2(3) |
| X3 | Cube, a ^ 3 | X3(5) |
> 1 + 2
3
> 5 - 3
2
> 4 * 5
20
> ((44.3 * 55) + (2 * 5) - 33.3)
2413.2
> COS(RAD(45))
0.7071067811865476
> -2 * 5
-10
> -(2 * 5)
-10
> LCM(13342, 234334)
1563242114
> GCF(13342, 234334)
2
> 6 * PI
18.84955592153876
> EN
2.718281828459045
> 40-(1+2)
37
> RND
0.3398089438635673
Exp => Term [+-] Term
Term => Power [*/] Power
Power => Factor [^%] Factor
Factor => [+-] Number | ( Exp ) | Function
Function => Ident ( ArgList )
ArgList => Exp , Exp
This parser uses recursive descent. The language is LR(0), which means Left to Right Associative with zero lookahead symbols.
1. James McCaffrey, "The Normal Cumulative Density Function in C#", http://jamesmccaffrey.wordpress.com, 2014.