Write a machine language program that reads in a number in hex and displays its two's complement in hex.
use the not and add instructions.

Question

Write a machine language program that reads in a number in hex and displays its two's complement in hex.
use the not and add instructions.

Accepted Answer

```assembly ; Assume the input number is stored in register AX ; and the result will be stored in AX as well NOT AX ; Invert all bits of AX, performing bitwise NOT operation ADD AX, 1 ; Add 1 to AX to get the two's complement ``` ```assembly ; Main function to test the two's complement conversion ; Use case 1: Convert 0xFFFF (which is -1 in two's complement) MOV AX, 0xFFFF ; Load AX with the test value NOT AX ; Perform NOT operation ADD AX, 1 ; Add 1 to get the two's complement ; AX should now contain 0x0000, which is the two's complement of 0xFFFF ; Use case 2: Convert 0x1234 MOV AX, 0x1234 ; Load AX with the test value NOT AX ; Perform NOT operation ADD AX, 1 ; Add 1 to get the two's complement ; AX should now contain 0xEDCB, which is the two's complement of 0x1234 ``` ∻Explanation∻ ⚹The NOT instruction inverts all the bits in the register, and the ADD instruction adds 1 to the result, which gives us the two's complement of the original number.⚹ ∻Step-by-step Instruction∻ ‖ ▪ ⋮ Load the input number into the AX register. ‖ ‖ ▪ ⋮ Use the NOT instruction to invert all bits of the number. ‖ ‖ ▪ ⋮ Use the ADD instruction to add 1 to the inverted number to get the two's complement. ‖ ‖ ▪ ⋮ Define concrete use cases and testing cases for the program: for example, converting 0xFFFF and 0x1234 to their two's complement in hex. ‖ ∻Time Complexity∻ ⚹The time complexity is constant, O(1), because the number of operations does not depend on the size of the input.⚹ ∻Space Complexity∻ ⚹The space complexity is also constant, O(1), as it uses a fixed amount of memory (the AX register).⚹

Sia