solidity/test/libsolidity/smtCheckerTests/overflow/underflow_sub_signed.sol
2020-09-09 16:14:21 +02:00

22 lines
518 B
Solidity

pragma experimental SMTChecker;
contract C
{
function f(int8 x) public pure returns (int8) {
x = -2;
int8 y = x - 127;
assert(y == 127);
x = -128;
y = x - 127;
assert(y == 1);
x = 127;
y = x - (-127);
assert(y == -2);
return y;
}
}
// ----
// Warning 3944: (116-123): Underflow (resulting value less than -128) happens here.
// Warning 3944: (163-170): Underflow (resulting value less than -128) happens here.
// Warning 4984: (207-217): Overflow (resulting value larger than 127) happens here.