Qbasic program to get output using dry run table | SEE computer science programming guide in Qbasic -to find sum of numbers divisible by 4

 

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QBasic program to know the output of program using dry run table- to find the sum of numbers between 1 and 20 and which are divisible by 4, using sub procedure

declare sub sum(A)

A = 2

Call sum(A)

End

Sub sum (A)

    While A <= 20

        If A Mod 4 = 0 Then

            s = s + A

        End If

        A = A + 1

    Wend

    Print s

End Sub

Dry run table

A	While A<=20	If A Mod 4 = 0	S=s+A	A=A+1
2	yes	no		A=3
3	yes	no		A=4
4	yes	yes	S=s+A=0+4=4	A=5
5	yes	no		A=6
6	yes	no		A=7
7	yes	no		A=8
8	y	yes	S=4+8=12	A=9
9	yes	n		=10
10	yes	n		=11
11	yes	N		=12
12	yes	y	=12+12=24	A=13
13	yes	n		=14
14	yes	n		=15
15	yes	n		=16
16	yes	y	=24+16=40	=17
17	yes	n		=18
18	yes	n		=19
19	yes	n		=20
20	yes	y	=40+20=60	21
21	no

output:60