- **Assembly Language Programming (ALP) Forum**
(*http://www.go4expert.com/forums/assembly-language-programming-forum/*)

- - **Little Man Computer Program Help**
(*http://www.go4expert.com/forums/little-computer-program-help-t29855/*)

Little Man Computer Program HelpI am trying to write two different programs in LMC using an old assembly language. The first as is follows:
Writea LMC program that takes two inputs, a number to count down from, and the stepvalue (example: count down from 35 by 5), until it reaches zero. It should print each step, and the lastnumber before zero if the sequence doesn’t end on zero, but if the number goesto negative, that number should not be printed. Example output using 13 and 3 as inputs would be: 13, 10, 7, 4, 1. Example output using 12 and 3 as inputs wouldbe: 12, 9, 6, 3, 0. I have tried something along the lines of this: IN STO 91 IN STO 92 IN STO 93 LDA 91 ADD 92 SUB 93 OUT HLT Which does not work The second LMC program I am trying to write is as follows: Writethe code to calculate the area and perimeter of a triangle. The program should take 3 inputs, which are,in order, the base, height, and the third side of the triangle. The code shouldproduce 2 values in the output box, the first number will be the area and thesecond, the perimeter. (Hint: you’ll probably want to use DAT statements tostore some values to start). I do not even know where to start on this one. Any help would be appreciated. I found a working simulator at this website: I also have some example codes to help: Calculate perimeter & area - takes L & W as inputs prints out perimeter first, then area. 00 LDA #01; 01 STA 99; 02 IN; 03 STA 98; 04 LDA #00; 05 STA 96; 06 IN; 07 STA 97; 08 ADD 97; 09 ADD 98; 10 ADD 98; 11 OUT; 12 LDA 96; 13 ADD 98; 14 STA 96; 15 LDA 97; 16 SUB 99; 17 STA 97; 18 SKZ; 19 JMP 12; 20 LDA 96; 21 OUT; 22 HLT; MULTIPLIES TWO NUMBERS. 00 IN; 01 STA 99; 02 STA 97; 03 IN; 04 STA 98; 05 SUB 90; 06 STA 98; 07 SKZ; 08 JMP 12; 09 LDA 97; 10 OUT; 11 HLT; 12 LDA 97; 13 ADD 99; 14 STA 97; 15 LDA 98; 16 JMP 05; 90 DAT 001; ADDS THE FIRST NUMBER INPUT TO ITSELF, THEN SUBTRACTS THE SECOND INPUT FROM THE TOTAL 00 IN; 01 STA 90; 02 IN; 03 STA 91; 04 LDA 90; 05 ADD 90; 06 SUB 91; 07 OUT; 08 HLT; ONE WAY OF COUNTING FROM AN INPUT DOWN TO ZERO 00 IN; 01 OUT; 02 SUB 98; 03 SKP; 04 JMP 06; 05 JMP 01; 06 HLT; 98 DAT 002; SQUARING A NUMBER 00 IN; take input 01 STA 99; save value as a mulitiplier 02 STA 97; save value as multiplicand 03 SUB 90; subtract one from counter 04 STA 98; copy value to counter 05 LDA 97; load our accumulator number 06 ADD 99; Add original number 07 STA 97; store intermediate sum 08 LDA 98; Load counter 09 SUB 90; subtract one from counter 10 STA 98; Store counter value 11 SKZ; skip if counter is at zero 12 JMP 05; othewise, loop back to 5 13 LDA 97; load our squared number 14 OUT; Write output 15 HLT; stop 90 DAT 01; countdown value |

All times are GMT +5.5. The time now is 13:17. |