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PODOS assembly read two succeeding characters, and convert to number
 

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  1. PODOS assembly read two succeeding characters, and convert to number
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    <p>I'm writing a simple program that takes in two numbers between 1-99, adds them and prints out the result. I'm done with the printing part, I can print up too three digits, 99+99=198 so it's enough for this program. I have the program working for two one digit numbers. </p> <p>Example: 1 1 = 2 , 4 4 = 8 </p> <p>So the digits is separated by spaces. Now I need the following; 11 1 = 12, 1 45 = 46</p> <p>what I got so far, when I first read a valid number i store it on the stack while I check what the next char is, if the next is space then this number is only one-digit. If I have another character I have to multiply the first by 10 and then add the latest character. </p> <p>22 would be read like this: 2 2*10 = 20+2 = 22 </p> <p>Note that the rest of my program needs the result from this to be in register dl. Got one tiny question about registers and assembly, can a number stored in dl be referenced with dx? I'm wondering because mov and arithmetic operators seems to demand that the registers(operands) are of the same size. </p> <p>My code so far</p> <pre><code>ReadNumber: ;; Reads one number 1-99 push ax push bx push cx Lokke: ;; reads from keyboard mov ah,01h int 21h cmp al, " " je Lokke cmp al,"0" jb PrintError cmp al,"9" ja PrintError ;; First character is a valid number push ax ;;storing the first on the stack while checking the next character mov ah,01h int 21h cmp al," " je OneNumber ;;This part runs if the next char is a valid digit. mov cl, al ;cl next digit pop ax ; getting back the first from the stack sub ax,"0" THIS LINE IS ADDED THANKS!!!! mov bl, 10 mul bl add ax, cx mov dx,ax mov dh,0 ;success variable set to true mov dl,al sub dl,"0" pop ax pop bx pop cx ret OneNumber: pop ax ;; Don't need it. mov dh,0 ;success variable set too true mov dl,al sub dl,"0" pop ax pop bx pop cx ret </code></pre> <p>This does not work properly, not even for one-digit numbers, I can't understand why :( It looks just fine! Thanks for input :) </p>
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    1. USpavium
    1. USAlgific
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    1. COThe code does compile tough. For 2 2 it would just return that last digit entered as the answer. Two-digit math returns (it seems) random wrong output.
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      1. USAlgific
    2. COUpdated with the sub ax,"0" in the right place.
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      1. USAlgific
    3. COFYI: this isn't dos assembly, this is intel x86 assembly. DOS just happens to run on x86 machines. :-)
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      1. USPaul Nathan
 

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