Chapter 3 : Flow Control

Question 1

What does Flow Control Statement does?

Answer 1

1. To control the flow or execute of a program

Question 2

What are the 2 types Flow Control Statement?

Answer 2

1. Entity Control
2. Exit Control

Question 3

What does Entry Control checks?

Answer 3

1. Checks the condition before the actual code executes

Question 4

What does Exit Control checks?

Answer 4

1. Checks the condition at the end or atlast

Question 5

List out examples for Entry Control check?

Answer 5

1. For Loop
2. While Loop

Question 6

List out examples for Exit Control check?

Answer 6

1. Do-while Loop

Question 7

What does Flow Control allows?

Answer 7

1. Allows us to dictate what statements are to be executed

Question 8

What method that assembly language provides for flow control? ( 2 )

Answer 8

1. Loops
2. Jumps

Question 9

List out 2 kinds of Jump statements

Answer 9

1. Conditional Jumps
2. Uncondional Jumps

Question 10

How to create a program that loops the asterik ( * ) 80 times?

Answer 10

.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

Question 11

What is conditional jumps?

Answer 11

1. Jump statements which moves control to another part of the program depending on the value of the flags

Question 12

What is unconditional jumps?

Answer 12

1. Jump statements which moves control to another part of the program regardless of the value of the flags

Question 13

How to create conditional jumps

Answer 13

.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

Question 14

What is the command for equal to?

Answer 14

1. JE
2. =