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if elif else ... and while
this example from a Well House Consultants training course
More on this [link]

This example is described in the following article(s):
   • Learning to program - where to start if you have never programmed before - [link]

Source code: five Module: R050

print "How tall are you? "
height = gets.to_f # Read a number and convert from string to float

print "How heavy are you? "
weight = gets.to_f

bmi = weight / height / height

while bmi > 25

print "You are #{height}m tall and weigh #{weight} kgs\n"
print "Your bmi is #{bmi} based on that data\n"

# Note - setting a value within the conditions to come
# up with a commonallity for shared code later on!

if bmi < 20
        puts "You need to eat like a horse"
        whatyou = "skinny"
elsif bmi > 40
        puts "Go see a doctor"
        whatyou = "obese"
elsif bmi > 30
        puts "cut your food intake"
        whatyou = "plump"
else
        puts "You's about right"
        whatyou = "healthy"
end

puts "We would describe you as ... #{whatyou} !"

bmi = weight / height / height
weight = weight - 2

end

__END__

Sample output:

wizard:rs10 graham$ ruby five
How tall are you? 1.9
How heavy are you? 120
You are 1.9m tall and weigh 120.0 kgs
Your bmi is 33.2409972299169 based on that data
cut your food intake
We would describe you as ... plump !
You are 1.9m tall and weigh 118.0 kgs
Your bmi is 33.2409972299169 based on that data
cut your food intake
We would describe you as ... plump !
You are 1.9m tall and weigh 116.0 kgs
Your bmi is 32.6869806094183 based on that data
cut your food intake
We would describe you as ... plump !
You are 1.9m tall and weigh 114.0 kgs
Your bmi is 32.1329639889197 based on that data
cut your food intake
We would describe you as ... plump !
You are 1.9m tall and weigh 112.0 kgs
Your bmi is 31.5789473684211 based on that data
cut your food intake
We would describe you as ... plump !
You are 1.9m tall and weigh 110.0 kgs
Your bmi is 31.0249307479224 based on that data
cut your food intake
We would describe you as ... plump !
You are 1.9m tall and weigh 108.0 kgs
Your bmi is 30.4709141274238 based on that data
cut your food intake
We would describe you as ... plump !
You are 1.9m tall and weigh 106.0 kgs
Your bmi is 29.9168975069252 based on that data
You's about right
We would describe you as ... healthy !
You are 1.9m tall and weigh 104.0 kgs
Your bmi is 29.3628808864266 based on that data
You's about right
We would describe you as ... healthy !
You are 1.9m tall and weigh 102.0 kgs
Your bmi is 28.808864265928 based on that data
You's about right
We would describe you as ... healthy !
You are 1.9m tall and weigh 100.0 kgs
Your bmi is 28.2548476454294 based on that data
You's about right
We would describe you as ... healthy !
You are 1.9m tall and weigh 98.0 kgs
Your bmi is 27.7008310249307 based on that data
You's about right
We would describe you as ... healthy !
You are 1.9m tall and weigh 96.0 kgs
Your bmi is 27.1468144044321 based on that data
You's about right
We would describe you as ... healthy !
You are 1.9m tall and weigh 94.0 kgs
Your bmi is 26.5927977839335 based on that data
You's about right
We would describe you as ... healthy !
You are 1.9m tall and weigh 92.0 kgs
Your bmi is 26.0387811634349 based on that data
You's about right
We would describe you as ... healthy !
You are 1.9m tall and weigh 90.0 kgs
Your bmi is 25.4847645429363 based on that data
You's about right
We would describe you as ... healthy !
wizard:rs10 graham$

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