2019-12-04 12:11:13 +00:00
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pragma experimental SMTChecker;
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contract C {
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2020-12-16 17:32:34 +00:00
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function mul(uint8 a, uint8 b) public pure returns (uint8) {
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2019-12-04 12:11:13 +00:00
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if (a == 0) {
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return 0;
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}
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2020-12-16 17:32:34 +00:00
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uint8 c = a * b;
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2019-12-04 12:11:13 +00:00
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require(c / a == b);
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return c;
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}
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}
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2020-08-11 13:53:24 +00:00
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// ----
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2021-01-21 18:04:34 +00:00
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// Warning 4984: (152-157): CHC: Overflow (resulting value larger than 255) happens here.\nCounterexample:\n\na = 128\nb = 2\n = 0\nc = 0\n\nTransaction trace:\nC.constructor()\nC.mul(128, 2)
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2020-12-16 17:32:34 +00:00
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// Warning 6838: (169-179): BMC: Condition is always true.
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