There are two different types of numbers in F#:
-6
, 0
, 1
, 25
, 976
and 500000
.-2.4
, 0.1
, 3.14
, 16.984025
and 1024.0
.The two most common numeric types in F# are int
and float
. An int
is a 32-bit integer and a float
is a 64-bit floating-point number.
Arithmetic is done using the standard arithmetic operators. Numbers can be compared using the standard numeric comparison operators and the equality (=
) and inequality (<>
) operators.
Converting between number types is done through built-in conversion operators. These conversion operators are named after the type they will be converting to. F# does not support automatic conversion between number types.
The most common way to conditionally execute code in F# is by using an if/elif/else
expression:
if x = 5 then
printfn "Expression to evaluate when x equals 5"
elif x > 7 then
printfn "Expression to evaluate when x greater than 7"
else
printfn "Expression to evaluate in all other cases"
The condition(s) used in an if/elif/else
expression must be of type bool
. F# has no concept of truthy values.
In this exercise you'll be writing code to analyze the production of an assembly line in a car factory. The assembly line's speed can range from 0
(off) to 10
(maximum).
At its lowest speed (1
), 221
cars are produced each hour. The production increases linearly with the speed. So with the speed set to 4
, it should produce 4 * 221 = 884
cars per hour. However, higher speeds increase the likelihood that faulty cars are produced, which then have to be discarded. The following table shows how speed influences the success rate:
0
: 0% success rate.1
to 4
: 100% success rate.5
to 8
: 90% success rate.9
: 80% success rate.10
: 77% success rate.You have three tasks.
Implement the successRate
function to calculate the success rate based on the production speed:
successRate 6
// => 0.9
Implement the productionRatePerHour
function to calculate the assembly line's production rate per hour, taking into account its success rate:
productionRatePerHour 6
// => 1193.4
Note that the value returned is a float
.
Implement the workingItemsPerMinute
function to calculate how many working cars are produced per minute:
workingItemsPerMinute 6
// => 19
Note that the value returned is an int
.
Sign up to Exercism to learn and master F# with 14 concepts, 132 exercises, and real human mentoring, all for free.