Evaluate Expression Assignment Answers

Question:

Q3(A) Evaluate the following expressions with explanation for each one: (5 only)

4- z=--x*y +(++y-5)% ++1;

5- z=(x<--y)&&(x>5);

Evaluate Expression Answer and Explanation

1. `z = ++x - y--;`

- `++x` increments `x` before using it, so `x` becomes 11.

- `x` is currently 11 and `y` is 7.

- `x ^ y` performs a bitwise XOR on 11 and 7:

- Binary of 11: `1011`

- Binary of 7: `0111`

3. `z++ = 2 * ++2 + --x * --2;`

- This expression is syntactically incorrect in C/C++. The post-increment operator `z++` cannot be used as an l-value to assign a value.

- Now, evaluate each part:

- `--x * y`: `10 * 8 = 80`

- Now, evaluate the logical expressions:

- `x < --y`: `11 < 7` is `false`

6. `x <<= 2;`

- This is a bitwise left shift assignment.

- Therefore, `x = 44`.

- Explanation: Left shifting 11 by 2 bits results in 44.

- Binary of 7: `0111`

- After shifting 1 bit to the right: `0011` (which is 3 in decimal)

2. `z = (x ^ y + x & y);` → `z = 15`

3. `z++ = 2 * ++2 + --x * --2;` → Syntax error