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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