Operation of Assemblers

MOV R1, R0        ; Store the first                 ; value in R1

SWI getInt        ; Get second value

MOV R2, R0        ; Store in register         ; R2

MOV R3, R1        ; R3 = a

ADD R3, R2        ; R3 = a+b

MOV R4, R1        ; R4 = a

MOV R0, R3        ; Copy amswer to R0

SWI putInt        ; Operating system         ; call to display the         ; 16-bit integer in         ; R0

HLT        ; Terminate program.

2. a – b

SWI getInt        ; Operating         
        ; system call to                  ; get a 16 bit                  ; integer from                  ; the keyboard.                  ; Value returned                 ; in R0

MOV R1, R0        ; Store the first                 ; value in R1

SWI getInt        ; Get second value

MOV R2, R0        ; Store in register         ; R2

MOV R3, R1        ; R3 = a

SUB R3, R2        ; R3 = a-b

MOV R4, R1        ; R4 = a

MOV R0, R3        ; Copy amswer to R0

SWI putInt        ; Operating system         ; call to display the         ; 16-bit integer in         ; R0

HLT        ; Terminate program.

3. a x b

SWI getInt        ; Operating         
        ; system call to                  ; get a 16 bit                  ; integer from                  ; the keyboard.                  ; Value returned                 ; in R0

MOV R1, R0        ; Store the first                 ; value in R1

SWI getInt        ; Get second value

MOV R2, R0        ; Store in register         ; R2

MOV R3, R1        ; R3 = a

MUL R3, R2        ; R3 = a x b

MOV R4, R1        ; R4 = a

MOV R0, R3        ; Copy amswer to R0

SWI putInt        ; Operating system         ; call to display the         ; 16-bit integer in         ; R0

HLT        ; Terminate program.

4. a² + b²

        

SWI getInt        ; Operating         
        ; system call to                  ; get a 16 bit                  ; integer from                  ; the keyboard.                  ; Value returned                 ; in R0

MOV R1, R0        ; Store the first                 ; value in R1

SWI getInt        ; Get second value

MOV R2, R0        ; Store in register         ; R2

MOV R3, R1        ; R3 = a

SUB R3, R2        ; R3 = a - b

MOV R4, R1        ; R4 = a

ADD R4, R2        ; R4 = a + b

MOV R0, R3        ; Copy amswer to R0

SWI putInt        ; Operating system         ; call to display the         ; 16-bit integer in         ; R0

HLT        ; Terminate program.

5. a² + b²

        SWI getInt        ; Operating         
        ; system call to                  ; get a 16 bit                  ; integer from                  ; the keyboard.                  ; Value returned                 ; in R0

MOV R1, R0        ; Store the first                 ; value in R1

SWI getInt        ; Get second value

MOV R2, R0        ; Store in register         ; R2

MOV R3, R1        ; R3 = a

ADD R3, R2        ; R3 = a + b

MOV R4, R1        ; R4 = a

SUB R4, R2        ; R4 = a - b

MOV R0, R3        ; Copy amswer to R0

SWI putInt        ; Operating system         ; call to display the         ; 16-bit integer in         ; R0

HLT        ; Terminate program.