Statement: Find the number of negative elements (most significant bit 1) in a block of data. The length of the block is in memory location 2200H and the block itself begins in memory location 2201H. Store the number of negative elements in memory location 2300H
|
Sample problem 1:
(2200H) = 04H
(2201H) = 56H
(2202H) = A9H
(2203H) = 73H
(2204H) = 82H
Result = 02 since 2202H and 2204H contain numbers with a MSB of 1.
|
Source program :
- LDA 2200H
- MOV C, A : Initialize count
- MVI B, 00 : Negative number = 0
- LXI H, 2201H : Initialize pointer
- BACK: MOV A, M : Get the number
- ANI 80H : Check for MSB
- JZ SKIP : If MSB = 1
- INR B : Increment negative number count
- SKIP: INX H : Increment pointer
- DCR C : Decrement count
- JNZ BACK : If count 0 repeat
- MOV A, B
- STA 2300H : Store the result
- HLT : Terminate program execution
|
Flowchart for program
|
|
Related Programs for Beginners: (Click down)
Finding Two's complement of a number
Calculate the sum of series of numbers
Multiply two 8-bit numbers
Divide a 16 bit number by a 8-bit number