2019-12-04 12:11:13 +00:00
|
|
|
contract C {
|
2020-12-16 17:32:34 +00:00
|
|
|
function mul(uint8 a, uint8 b) public pure returns (uint8) {
|
2019-12-04 12:11:13 +00:00
|
|
|
if (a == 0) {
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
2020-12-16 17:32:34 +00:00
|
|
|
uint8 c = a * b;
|
2019-12-04 12:11:13 +00:00
|
|
|
require(c / a == b);
|
|
|
|
|
return c;
|
|
|
|
|
}
|
|
|
|
|
}
|
2021-03-31 15:11:54 +00:00
|
|
|
// ====
|
|
|
|
|
// SMTEngine: all
|
2020-08-11 13:53:24 +00:00
|
|
|
// ----
|
2021-03-31 15:11:54 +00:00
|
|
|
// Warning 4984: (120-125): 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)
|
|
|
|
|
// Warning 6838: (137-147): BMC: Condition is always true.
|
