Coding Exercise – LUA Programming – SPOJ Online Judge – 15711. Wow

This is another simple problem for practising LUA programming. The simple puzzle is from SPOJ Online Judge (see problem description)

This problem can be used to serve as a demo/example to show the basic usage of LUA programming. For above problem, we need to print x times of ‘o’ between ‘W’ and ‘w’.

We can use a for loop to concatenate the output string, using double dots.

x = tonumber(io.read())
s = 'W'
for i = 1, x do
	s = s..'o'
end
s = s..'w'
print(s)

Or, instead of print (which is intended for simple usages, debugging etc), we can use io.write() that will not output a blank newline each time.

x = tonumber(io.read())
io.write('W')
for i = 1, x do
	io.write('o')
end
io.write('w')

The inbuilt string.rep(c, x) allows repetition of characters c x times. Therefore, the above can be shorten into:

x = tonumber(io.read())
print('W'..string.rep('o', x)..'w')

Or, even shorter:

print('W'..string.rep('o', tonumber(io.read()))..'w')

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