Evaluate a mathematical expression by using the Shunting-yard algorithm to parse the input into a Reverse Polish notation.
$ ./calc
Expression: 23 + 6 * (4 / 3!) ^ -0.51 + ln(21)
Result: 33.42284763163235
- + addition
- - subtraction
- * multiplication
- / division
- ^ exponentiation
- ! factorial
- % modulus
- abs(x) absolute value
- sqrt(x) square root
- ln(x) natural logarithm
- log(x,y) logarithm in base x of y
- sin(x) sine of angle in radians
- cos(x) cosine of angle in radians
- tan(x) tangent of angle in radians
- asin(x) arcsine of angle in radians
- acos(x) arccosine of angle in radians
- atan(x) arctangent of angle in radians
- { [ ( ) ] }
- pi ratio of a circumference to the diameter
- e Euler’s constant
- -h to show the help
Additional functions can be easily implemented by adding its name and the corresponding character to the func vector and the character with the actual function pointer to either map1 or map2 map, depending on the number of arguments.