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sav08:assume_guarantee_reasoning_with_procedures [2008/04/09 10:42] vkuncak |
sav08:assume_guarantee_reasoning_with_procedures [2008/04/09 10:43] vkuncak |
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===== Postconditions that refer to pre state ===== | ===== Postconditions that refer to pre state ===== | ||
+ | <code> | ||
proc dec(x) | proc dec(x) | ||
requires x > 0 | requires x > 0 | ||
ensures x <= (old x) | ensures x <= (old x) | ||
{ x = x - 2; } | { x = x - 2; } | ||
+ | </code> | ||
+ | <code> | ||
proc Q() | proc Q() | ||
{ | { | ||
Line 44: | Line 47: | ||
c2; | c2; | ||
} | } | ||
+ | </code> | ||
===== Handling Parameters ===== | ===== Handling Parameters ===== | ||