Chapter 3 : Flow Control Flashcards
What does Flow Control Statement does?
- To control the flow or execute of a program
What are the 2 types Flow Control Statement?
- Entity Control
- Exit Control
What does Entry Control checks?
- Checks the condition before the actual code executes
What does Exit Control checks?
- Checks the condition at the end or atlast
List out examples for Entry Control check?
- For Loop
- While Loop
List out examples for Exit Control check?
- Do-while Loop
What does Flow Control allows?
- Allows us to dictate what statements are to be executed
What method that assembly language provides for flow control? ( 2 )
- Loops
- Jumps
List out 2 kinds of Jump statements
- Conditional Jumps
- Uncondional Jumps
How to create a program that loops the asterik ( * ) 80 times?
.model small
.stack 100h
.code
MAIN PROC
mov cx, 80 ; set counter to 80
mov ah,2 ; DOS function to display
mov dl, “*” ; character to display
top: int 21h ; call DOS interrupt
loop top ; repeat
mov ah,4Ch ; DOS termination
int 21h ; return to DOS MAIN ENDP end MAIN
top - is a variable name that
What is conditional jumps?
- Jump statements which moves control to another part of the program depending on the value of the flags
What is unconditional jumps?
- Jump statements which moves control to another part of the program regardless of the value of the flags
How to create conditional jumps
.model small
.stack 100h
.code
MAIN PROC
mov bl, 80 ; set register to 80
mov ah,2 ; DOS function to display
mov dl,”*” ; character to display
top : int 21h ; call DOS Interrupt
dec bl ; decrease BL by 1
cmp bl,0 ; check if BL is zero
jne top ; repeat if not equal to 0
mov ah, 4Ch ; DOS terminate
int 21h l return to DOS MAIN ENDP END MAIN
What is the command for equal to?
- JE
- =
