CS401 Assignment 1 Solution Fall 2018

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Solution: 

[org 0x0100] ; offset 

jmp start ; jump to start label 

arr: dw VUID ; AD VU ID 

size: dw 9 ; num of digit in id 

start: ; start here 

mov bx , 0  ; init bx 

mov cx , [size] ; init cx with id digit 

add cx , [size] ; add digit_id into cx 

mov si , 0 ; init si 

mov di , 0 ; init di 

  

go: 

cmp si , cx ; done? 

jg exit ; go to exit 

mov di , si ; put si into di 

add word di ,2 ; add 2 into di 

mov bx , si ; put si into bx 

  

sort:  

mov ax , [arr+di] ; 1st item into ax 

mov dx , [arr+bx] ; 2nd item inot bx 

cmp dx , ax ; lesser? 

jl relocate ; jump to relocate 

  

return: ; move next 

add di , 2 ; advance to next num 

cmp di , cx ; lesser? 

jl sort ; go to sorted 

jnl sorted 

relocate: ; relocation starts 

mov bx , di ; swap them 

jmp return ; go to next 

  

sorted: 

mov ax , [arr+si] ; x into ax 

mov dx , [arr+bx] ; y into dx 

mov [arr+si] , dx ; x = y 

mov [arr+bx] , ax ; y = x 

add word si ,2 ; add 2 into si 

jmp go 

exit: 

mov ax , 0x4c00 ; terminate 

  

int 0x21 

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