Integer overflow: Difference between revisions

=={{header|Lua}}==

Lua 5.3+ supports integer and floating sub-types of its generic number type. The ''standard'' implementation is 64-bit signed, under/overflow is not recognized.

<lang Lua>assert(math.type~=nil, "Lua 5.3+ required for this test.")

minint, maxint = math.mininteger, math.maxinteger

print("min, max int64 = " .. minint .. ", " .. maxint)

print("min-1 underflow = " .. (minint-1) .. " equals max? " .. tostring(minint-1==maxint))

print("max+1 overflow = " .. (maxint+1) .. " equals min? " .. tostring(maxint+1==minint))</lang>

{{out}}

<pre>min, max int64 = -9223372036854775808, 9223372036854775807

min-1 underflow = 9223372036854775807 equals max? true

max+1 overflow = -9223372036854775808 equals min? true</pre>