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You receive an input with a number and a string with a space in the middle. The string tells you what you need to do with the number, it can be:

sqrt - square root of number

sqr - square of number

cube - cube of number

abs - absolute of number

round - rounded version of number

You need to output the final result of the calculation with whatever you have. If your language doesn't have an input, you can hard-code that in.

Rules:

You can't use a math library, even if it is built-in.

You don't get a number or a result bigger than the highest possible one in your language.

Because of the vulnerability of the above rule, you can't use languages, which only support a 1 bit number. (1 and 0)

If your language doesn't support non-integer numbers, you need to output a rounded result.

Test cases

16 sqrt = 4

25 sqr = 625

3 cube = 27

-10 abs = 10

18.38 round = 18

Because this is a code-golf, the shortest answer in bytes wins.

Good luck!

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  • 1
    \$\begingroup\$ 25 sqr = 625? \$\endgroup\$ – andlrc Feb 12 '16 at 12:02
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    \$\begingroup\$ can sqrt result in decimal values eg 5 sqrt? \$\endgroup\$ – Eumel Feb 12 '16 at 12:02
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    \$\begingroup\$ Define a built-in math library \$\endgroup\$ – LegionMammal978 Feb 12 '16 at 12:03
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    \$\begingroup\$ @Bálint Javascript's Math is not a class. \$\endgroup\$ – SuperJedi224 Feb 12 '16 at 13:07
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    \$\begingroup\$ It's not clear what can be used to calculate the requested operation. any sort of functionality which allows you to calculate the square root of a number is prohibited makes the challenge, by definition, impossible. You'd also have to clarify what counts as rounding. \$\endgroup\$ – Dennis Feb 12 '16 at 18:39
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Mathematica, 155 153 bytes

{a=ToExpression@#,a a,a a a,c=a~Mod~1,a+Boole[c>=.5]-c,,,,If[Chop@a==0,0,a/Sign@a],If[a>0,(#+a/#)/2&~FixedPoint~1.,0]}[[Hash@#2~Mod~12]]&@@StringSplit@#&

Could probably be golfed further. Doesn't use "any sort of functionality, wich allows you to calculate the squareroot/square/cube/absolute/roubded version of a number."

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Bash - 141 137 132

t(){ for((;x*x!=$1;x++));do :;done;}
r(){ ((x=$1*$1));}
e(){ ((x=$1**3));}
s(){ x=${1#-};}
d(){ x=${1%.*};}
${2:${#2}-1} $1
echo $x

Run as

bash math.sh 16 sqrt
bash math.sh 25 sqr
bash math.sh 3 cube
bash math.sh -10 abs
bash math.sh 18.38 round

It strips the operation done to the last character, which is unique for each, then calls the appropriate function with the number

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  • \$\begingroup\$ How does the square root work if the number is not a perfect square? Wouldn't it be an infinite loop? (Maybe replace != with < ? Even then the rounding seems wrong) \$\endgroup\$ – senegrom Feb 12 '16 at 14:11
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ES6 - 124 bytes

(a,b)=>eval('_=>'+'{for(c=1;c*c<a;c++);return c}_a*a_a*a*a_a<0?-a:a_a.toFixed()'.split`_`['tresd'.indexOf(b[b.length-1])])()

Square root only works for rounded numbers. Sqrt of 15 will result in 4, I hope this is allowed. Re-writing a fully functional square root function feels like overkill.

Explanation

(a,b)=> // anonymous function
    eval(
        '_=>' + // construct an anonymous function to eval
        '{for(c=1;c*c<a;c++);return c} // sqrt
        _ // seperator
        a*a // sqr
        _
        a*a*a // cube
        _
        a<0?-a:a // abs
        _
        a.toFixed()' // round
        .split`_` // create an array of functions
        [ // select the function to use
            'tresd'.indexOf(b[b.length-1]) // get index of input
        ]
    )() // end eval and call the returned function

Golfing tips are welcome

Test cases:

f=
(a,b)=>eval('_=>'+'{for(c=1;c*c<a;c++);return c}_a*a_a*a*a_a<0?-a:a_a.toFixed()'.split`_`['tresd'.indexOf(b[b.length-1])])()

F=(a,b)=>document.body.innerHTML+='<pre>'+a+', '+b+':\n'+f(a,b)+'\n</pre>';

F(16,'sqrt')
F(25,'sqr')
F(3,'cube')
F(-10,'abs')
F(18.38,'round')

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  • \$\begingroup\$ It is. As some of the people mentioned here, you can use the last letter of the input instead of the whole word, because it is unique for every type. \$\endgroup\$ – Bálint Feb 12 '16 at 14:19
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Python 2, 153 bytes

S=str.split;x,f=S(raw_input())
exec'print '+dict(zip('tresd',S('[a for a in range(x)if a*a==x][0]|x*x|x**3|abs(x)|round(x)','|')))[f[-1]].replace('x',x)
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