Qbasic program to get output using dry run table | SEE computer science programming guide in Qbasic-2

 

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QBasic program to know the output of program using dry run table(p-2)

declare function reverse$(s$)

Cls

Input "enter a string"; s$

Print "the reverse of a string is"; reverse(s$)

End

Function reverse$ (s$)

    For i = Len(s$) To 1 Step -1

        r$ = r$ + Mid$(s$, i, 1)

    Next i

    reverse$ = r$

End Function

Output with dry run table:

If the input is 'program' then its dry run can be

S$	For i=len(s$) to 1 step-1	r$=r$+mid$(s$,I,1)
program	I=7	r$=m
	I=6	r$=m+a=ma
	I=5	R$=ma+r=mar
	I=4	r$=mar+g=marg
	I=3	r$=marg+o=margo
	I=2	r$=margo+r=margor
	I=1	r$=margor+p=margorp

Output:

margorp