Note: This is a class activity, nothing needs to be delivered.
All the following examples assume the code is contained within a module
called simple
.
f2c
that takes X
degrees Fahrenheit and converts them to degrees Celsius. Examples:
> simple:f2c(212). 100.000 > simple:f2c(32). 0.00000e+0Tip: ºC = (ºF - 32) × 5 ÷ 9
sign
that takes an integer value N. It returns
-1 if N is negative, 1 if
N is positive greater than zero, or 0 if
N is zero. Examples:
> simple:sign(10). 1 > simple:sign(-5). -1 > simple:sign(0). 0
Write a function called roots
that returns a tuple
containing the two possible roots that solve a quadratic
equation given its three coefficients (A, B,
C) using the following formula:
Examples:
> simple:roots(2, 4, 2). {-1.00000,-1.00000} > simple:roots(1, 0, 0). {0.00000e+0,0.00000e+0} > simple:roots(4, 5, 1). {-0.250000,-1.00000}Use the
math:sqrt
function to compute the square root
of a number.
The BMI (body mass index) is used to determine if a person's weight and height proportion is adequate. The BMI may be calculated using the following formula:
BMI = (Weight) ÷ (Height^{2})
Where Weight should be given in kilograms and Height in meters. The following table shows how different BMI ranges are classified:
BMI range | Description |
---|---|
BMI < 20 | underweight |
20 ≤ BMI < 25 | normal |
25 ≤ BMI < 30 | obese1 |
30 ≤ BMI < 40 | obese2 |
40 ≤ BMI | obese3 |
Write a function called bmi
that takes two
arguments: Weight and Height. It should
return an atom that represents the corresponding BMI description
computed from its input.
Examples:
> simple:bmi(55, 1.5). normal > simple:bmi(45, 1.7). underweight > simple:bmi(120, 1.6). obese3