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Kenji
on June 1, 2014
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Write a program that makes 2 + 2 = 5
It's only likely, but not certain that a or b get overwritten. How your stack is laid out is entirely up to the compiler. arr[1] is already out of bounds, however, we don't know for certain what's immediately above the array.
codeflo
on June 1, 2014
[–]
With compiler optimizations turned on, it's almost guaranteed
not
to happen, because a and b are very likely to be stored in CPU registers.
mgraczyk
on June 1, 2014
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parent
[–]
Or rather, a and b will be constant folded so that the printf call is optimized to "push #4; push ptrFmt; call printf"
Someone
on June 1, 2014
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[–]
A truly good compiler would replace that printf by a call to putchar or pass a constant string to 'write' (gcc almost (?) does that. See
http://www.ciselant.de/projects/gcc_printf/gcc_printf.html
)
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