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