I am a bit unclear about underflowing in terms of binary representation.
Let's say that an unsigned 8-bit variable gets overflown from the addition of $150+150$.
A signed 8-bit variable gets underflown after the subtraction of $-120-60$.
Now my point is let's think of 8-bit variable, we are subtracting $110-10$. Now let's convert this into an addition, $110+(-10)$. Since $-10$ is $11110110$ and $110$ is $01101110$. If we add these two binary numbers we will have a value after 8th bit to carry, which is I believe an overflown, however the final binary number is equal to $100$ and that's what we want and in terms of decimal value we did not lose anything. In that case do we have a overflow or underflow here?