CSE 322 Spring 2021 Lab 4

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Task #1 (Example 6.6) [AND condition]

Read a character, and if it’s an uppercase letter, display it.

//Code
.MODEL small
.STACK 100H
.DATA      
.CODE
MAIN Proc
    mov ax, @data
    mov ds, ax   
    
    mov ah, 1
    int 21h
    cmp al, 'A'
    jl noPrint
    cmp al, 'Z' 
    jg noPrint
    
    mov ah, 2
    mov dl, al
    int 21h

noPrint:    
    
    ;Exit code
    mov ah, 4ch
    int 21h
    
    
endp MAIN

end MAIN

Task #2 (Example 6.7) [OR condition]

Read a character. If it’s “y” or “Y”, display it; otherwise, terminate the program.

//Code
.MODEL small
.STACK 100H
.DATA                              
.CODE
MAIN Proc
    mov ax, @data
    mov ds, ax   
    
    mov ah, 1
    int 21h
    cmp al, 'Y'
    je print
    cmp al, 'y' 
    je print 
    jmp exit
    
print:
    mov ah, 2
    mov dl, al
    int 21h

exit:    
    ;Exit code
    mov ah, 4ch
    int 21h
    
    
endp MAIN

end MAIN 

Task #3 (Example 6.9) [While structure]

Write some code to count the number of characters In an input line.

//Code
.MODEL small
.STACK 100H
.DATA                              
.CODE
MAIN Proc
    mov ax, @data
    mov ds, ax   
    
    mov cx, 0
    mov ah, 1
abc:    
    int 21h
    cmp al, 0dh
    je exit 
    inc cx 
    jmp abc
    

exit:    
    ;Exit code
    mov ah, 4ch
    int 21h
    
    
endp MAIN

end MAIN

Task #4 (Example 6.10) [Repeat Structure]

Write some code to read characters until a blank is read.

//Code
.MODEL small
.STACK 100H
.DATA                              
.CODE
MAIN Proc
    mov ax, @data
    mov ds, ax   
    
    mov ah, 1
abc:
    int 21h
    cmp al, ' '
    jne abc 
    

exit:    
    ;Exit code
    mov ah, 4ch
    int 21h
    
    
endp MAIN

end MAIN

Task #5 (Chapter 6 Exercise 9)

Write a program to display the extended ASCII characters (ASCII codes 80h to FFh). Display 10 characters per line, separated by blanks. Stop after the extended characters have been displayed once.

//Solution
To be done by students

Task #6(Chapter 6 Exercise 10)

Write a program that will prompt the user to enter a hex digit character (“0″·… “9” or “A” … “F”), display it on in decimal. If the user enters an illegal character, display ‘i’ to indicate invalid input and allow to enter new hex number.

Sample execution
0-0
1-1
2-2
A-10
B-11
C-12
D-13
X-i
z-i
a-i
E-14
F-15
8-8
//Solution
To be done by students

 

Task #7 (Chapter 6 Exercise 11)

Do problem no 6 but if three invalid input is given, terminate the program

//Solution
To be done by students

 

Homework

  • Section 6.5: Programming with High-Level Structures
  • Chapter 6 Exercise 8
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