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| Help with program to convert hex to dec Hi, I need to write a program in the LC-3 assembly language to convert hex to dec. Here are the exact guidelines: "Your program begins at x3000. Beginning at x4000 is a list of any length of positive numbers, terminated with a -1. Your program must display each number in the list in its decimal value. The numbers should be displayed as you would normally write them, with leading zeroes suppressed. Then halt." Heres what I have so far, my main problem is the actual conversion. .orig x3000 and r0,r0,#0 ; clear all registers and r1,r1,#0 and r2,r2,#0 and r3,r3,#0 and r4,r4,#0 and r5,r5,#0 and r6,r6,#0 ld r3,hex ; point to the character string loop ldr r0,r3,#0 ; load the character add r1,r0,#1 brz end ; see if we have xFFFF (means done) trap x21 ; print the character add r3,r3,#1 ; increment the address pointer brnzp loop end trap x25 hex .fill x4000 .end If anyone can help even in the least I would really appreciate it. Thanks for your time in looking at this, Aaron |
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| Re: Help with program to convert hex to dec **Update** I have spent the entire day working on this probelm now and it works except for even numbers after the first digit (ex: x2435). The first digit can be found correctly and also odd digits but any even digits will mess the output up. If anyone knows what i'm forgetting please let me know. THANKS THE PROGRAM IS BELOW : .orig x3000 and r0,r0,#0 ; clear all registers and r1,r1,#0 and r2,r2,#0 and r3,r3,#0 and r4,r4,#0 and r5,r5,#0 and r6,r6,#0 ld r5,hex ; point to the character string startover add r5,r5,#1 and r4,r4,#0 ldr r0,r5,#0 ; load the character add r1,r0,#1 brz end ; see if we have xFFFF (means done) and r1,r1,#0 ;clear R1 now, using it later ld r1,frstdig ;finding first digit of hex not r1,r1 ;start subtraction (for divide) add r3,r0,r1 add r3,r3,#1 brn print1 add r4,r4,#1 add r2,r1,r3 add r2,r2,#1 brn print1 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print1 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print1 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print1 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print1 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print1 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print1 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print1 and r4,r4,#0 print1 add r0,r4,#0 add r1,r0,#15 add r0,r1,#15 add r1,r0,#15 add r0,r1,#3 trap x21 and r4,r4,#0 ;find value of 2nd hex ld r1,scndig ;load 2^8 not r1,r1 ;start subtraction (for divide) add r3,r3,r1 add r3,r3,#1 brn print2 add r4,r4,#1 add r2,r1,r3 add r2,r2,#1 brn print2 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print2 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print2 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print2 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print2 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print2 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print2 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print2 print2 add r0,r4,#0 add r1,r0,#15 add r0,r1,#15 add r1,r0,#15 add r0,r1,#3 trap x21 and r4,r4,#0 ;find value of 3rd hex ld r1,thrdig ;load 2^4 not r1,r1 ;start subtraction (for divide) add r3,r3,r1 add r3,r3,#1 brn print3 add r4,r4,#1 add r2,r1,r3 add r2,r2,#1 brn print3 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print3 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print3 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print3 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print3 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print3 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print3 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print3 print3 add r0,r4,#0 add r1,r0,#15 add r0,r1,#15 add r1,r0,#15 add r0,r1,#3 trap x21 and r4,r4,#0 ;find value of 4th hex ld r1,frthdig ;load 2^0 not r1,r1 ;start subtraction (for divide) add r3,r3,r1 add r3,r3,#1 brn print4 add r4,r4,#1 add r2,r1,r3 add r2,r2,#1 brn print4 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print4 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print4 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print4 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print4 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print4 add r4,r4,#1 add r2,r3,r1 add r2,r2,#1 brn print4 add r4,r4,#1 add r3,r2,r1 add r3,r3,#1 brn print4 print4 add r0,r4,#0 add r1,r0,#15 add r0,r1,#15 add r1,r0,#15 add r0,r1,#3 trap x21 and r0,r0,#0 add r0,r0,#13 trap x21 brnzp startover end trap x25 hex .fill x3FFF frstdig .fill x1000 scndig .fill x0100 thrdig .fill x0010 frthdig .fill x0001 .end |
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