solidity/test/libsolidity/smtCheckerTests/overflow/underflow_sub.sol
2020-12-09 19:55:18 +01:00

17 lines
526 B
Solidity

pragma experimental SMTChecker;
contract C
{
function f(uint8 x) public pure returns (uint) {
x = 0;
uint8 y = x - 1;
assert(y == 255);
y = x - 255;
assert(y == 1);
return y;
}
}
// ----
// Warning 3944: (117-122): CHC: Underflow (resulting value less than 0) happens here.\nCounterexample:\n\nx = 0\n = 0\n\nTransaction trace:\nconstructor()\nf(0)
// Warning 3944: (150-157): CHC: Underflow (resulting value less than 0) happens here.\nCounterexample:\n\nx = 0\n = 0\n\nTransaction trace:\nconstructor()\nf(0)