Question

assembly languageprogram to swap the values of two variables

Answer 1

/*Hi, I will be using "//" and "/**/" for comments. This program iswritten in Pep8 which is a generic Instruction set that should beadequate for you tounderstand the process of what is goingon.*/
var1: .BLOCK 2 //make room for var1
var2: .BLOCK 2 //make room for var2
temp; .BLOCK 2 //make room for temp var
msg1: .ASCII "Input var1x00"
msg2: .ASCII "Input var2x00"
//beginning of the program with user prompts
main:STRO msg1,d
DECIvar1,d
STAvar1,d
STROmsg2,d
DECIvar2,d
STAvar2,d
//swapping portion - you must perform 3 variable swaps for anyswitch and you must use the register to do so
LDAvar2,d //load the register
STAtemp,d //store it
LDAvar1,d
STAvar2,d
LDAtemp,d
STAvar1,d
/*
this is equivalent to:
temp = var2;
var2 = var1;
var1 = temp;
in C++/Java
*/
.END

Answer 2

To move/swap two variable values using assembly language,wedo following assy lang programming
MOV EAX,A// first move value of A toregister EAXMOV EBX,B// move value of B to registerEBX
MOVB,EAX// move value ofregisterEAX toB
MOVA,EBX// move value ofregisterEBX toADon't forget to rate me!!!