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Assembly

Assembly. Session 10 string manipulations. MOVING Strings. Determine Current Location Determine New Location Determine number of bytes to transport TRANSPORT. START. Flow. init current + future pointers. Read Current Write Future. char was a $.

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Assembly

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  1. Assembly Session 10 string manipulations

  2. MOVING Strings • Determine Current Location • Determine New Location • Determine number of bytes to transport • TRANSPORT

  3. START Flow init current + future pointers Read Current Write Future char was a $ increase both currentand future pointers by 1 YES NO STOP

  4. Code PROG EQU 0100h FROM EQU 0020h TO EQU 8000h EOT EQU 0024h ;---------------------------------------------------------- ORG 0000h jp PROG ; ;---------------------------------------------------------- ORG FROM DB "Inholland Is Great!!$" ;---------------------------------------------------------- ORG PROG ; This routine moves a string to ; another location and ends with a stop ; when a $ is reached ; ld BC,FROM ld HL,TO loop: ld a,(BC) ld (hl),a inc BC inc HL ; cp EOT jp nz,loop ; ; endmov: halt

  5. String reverse diverse methods: • using pointers • move one forward, the other backwards • using stack • stack is first in, last-out

  6. principle H E L L H E L L L L E H O O O PUSH POP

  7. Flow START stack the string unstack the string STOP

  8. Stack stack the string point at stringmake a token Read pointed characterstack character and eventual token char was end of string? increase pointer NO YES

  9. Unstack unstackthe string point at destination POP a characterand store it at destination Token? increase pointer NO YES

  10. BUBBLESORT H E L L O E H L L O E H L L O E H L L O E H L L O

  11. BUBBLESORT 2 E H L L O E H L L O E H L L O E H L L O E H L L O

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