This is for LC3 op codes Write a program to reverse a sentence and store the rev
ID: 3714722 • Letter: T
Question
This is for LC3 op codes
Write a program to reverse a sentence and store the reversed string in place (In place reversal implies that the original string is replaced with the reversed string at its location). Also, display the reversed string on the screen. (The string should start at memory location 0x5000 and your code should start at memory location 0x3000). For example, if the original starting at 0x5000 was “Dazzling!”, the reversed string should be “!gnilzzaD” occupying the same location from 0x5000.
Explanation / Answer
Below lc3 code used to reverse a given string.
hope this helps...
Thankyou... :)
* Reverse a string
REVERSE CSECT
USING REVERSE,R13 base register
B 72(R15) skip savearea
DC 17F'0' savearea
STM R14,R12,12(R13) prolog
ST R13,4(R15) "
ST R15,8(R13) "
LR R13,R15 "
MVC TMP(L'C),C tmp=c
LA R8,C @c[1]
LA R9,TMP+L'C-1 @tmp[n-1]
LA R6,1 i=1
LA R7,L'C n=length(c)
LOOPI CR R6,R7 do i=1 to n
BH ELOOPI leave i
MVC 0(1,R8),0(R9) substr(c,i,1)=substr(tmp,n-i+1,1)
LA R8,1(R8) @c=@c+1
BCTR R9,0 @tmp=@tmp-1
LA R6,1(R6) i=i+1
B LOOPI next i
ELOOPI XPRNT C,L'C print c
L R13,4(0,R13) epilog
LM R14,R12,12(R13) "
XR R15,R15 "
BR R14 exit
C DC CL12'dlrow olleH'
TMP DS CL12
YREGS
END REVERSE
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