qbasicmathoperators.doc

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QBasic Lesson 4: QBasic’s Math Operators (7)

OBJECTIVES:

• Using QBasic Math O!"ato"s

• Us! O"d!" o# O!"ation

• Sto"! th! "!s$%ts o# ca%c$%ations in &a"ia'%!s

• ("int th! "!s$%t o# ca%c$%ations

) Math Operator is a s*+'o% $s! #o" addition, s$'t"action, +$%ti%ication, di&ision, o" oth!"ca%c$%ations

The QBasic math operators and their meanings.

Symbo Meaning

- M$%ti%ication

/i&ision

)ddition

S$'t"action

2 Eon!ntiation

Int!g!" di&ision

MO/ Mod$%$s

o$ can not $s! th! 6 #o" +$%ti%ication '!ca$s! QBasic "!ads it as a &a"ia'%!.

o$ can $s! th! addition and s$'t"action o!"ato"s '* th!+s!%&!s to indicat! ositi&! and n!gati&!

n$+'!"s. 8o" this "!ason th! addition and s$'t"action o!"ato"s a"! ca%%!d !nary operators.

o$ $s! int!g!" di&ision to "od$c! th! int!g!" 9o" ho%!n$+'!"; "!s$%t o# a di&ision. Int!g!"di&ision a%a*s "od$c!s an int!g!" "!s$%t and disca"ds an* "!+aind!". o$ do not ha&! to $t Int!g!"s on 'oth sid!s o# th! s%ash 9; .

"#ampe: ($%&'47.%)

orm!a *es!ts

5= 47

>5.0= 47

>5=.0 47>5.0=.0 47


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Th! MO+ o!"ato" do!s not $s! a s*+'o%. MO+ "od$c!s th! +od$%$s, o" int!g!" "!+aind!", o#di&ision.

"#ampe:

orm!a MO+

*es!ts

+i,ision

*es!t

< MO/ = -


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Order o0 Operation

Order Operator

1 Eon!ntiation 92;

= Una"* )ddition and S$'t"action

3 M$%ti%ication, di&ision, int!g!" di&ision, MO/ 9 -, , , MO/;

4 )ddition, s$'t"action

I# *o$ ant to o,erride the order o0 operation, $t a"!nth!s!s in th! ca%c$%ations.

Can *o$ #ind th! !""o" in th! #o%%oing cod!

2 %ompte the average of three grades

L"T grade 56

L"T grade' $5

L"T grade@ 7@

L"T a,g grade A grade' A grade@ & @

*;


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@!&i! Q$!stions

1. Dhat a"! th! "!s$%ts o# th! #o%%oing !"!ssionsa. 1 = - 4 =b. 9 1 = ; - 4 =c. 1 = - 9 4 = ;

=. Dhat a"! th! "!s$%ts o# th! #o%%oing !"!ssionsa. > = 1b. 9 1 910 9 = = ;;;

3. Dhat is th! o$t$t o# th! #o%%oing cod!

L"T a 6

L"T b -

*;


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@!&i! Q$!stion )FSDE@S

7. Dhat a"! th! "!s$%ts o# th! #o%%oing !"!ssionsa. 1 = - 4 = ? %b. 9 1 = ; - 4 = ? 6c. 1 = - 9 4 = ; ? %


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Lesson 4 "#ercises

8o" !ach o# th! #o%%oing "og"a+s +aG! s$"! *o$ $s! "!+a"Gs and c%!a" th! sc"!!n h!"!n!c!ssa"*. Sa&! a co* o# !ach to *o$" ho+! #o%d!". T$"n in a ha"dco* o# !ach "og"a+s "int o$tthat inc%$d!s *o$" na+! on th! #i"st %in!, th! "og"a+ na+! on th! s!cond %in! and #o%%o!d '* #o$"

'%anG %in!s '!#o"! th! "int o$t o# th! "og"a+ a!a"s. )%so t$"n in a ha"dco* o# th! "og"a+cod! and th! cod! on disG.

1. D"it! and sa&! a "og"a+ 9E!"4H1.'as; that "ints !ach o# th! #i"st nin! o!"s o# =, '!ginning ith th! !"o o!". Us! th! a"o"iat! "!+a"Gs at th! '!ginning o# *o$" "og"a+. C%!a" th! sc"!!n in th! a"o"iat! %ac!. ("int st"ing constants that d!sc"i'! !ach "int!d ans!" as #o%%os: = "ais!d to th! !"o o!" is 1

=. D"it! and sa&! a "og"a+ 9E!"4H=.'as; that co+$t!s and "ints a 'on$s o# 15 !"c!nt o#th! g"oss a* #o" John S+ith. /ont taG! ta!s o$t o# th! 'on$s. )#t!" "inting th! #o$"

&a"ia'%!s, g"oss(a*, ta!s, 'on$s and n!t(a*, "int a a*ch!cG to th! "int!". )dd st"ingconstants so that th! ch!cG inc%$d!s th! na+! o# th! a*!!. ("int *o$" na+! as th! a*o" atth! 'otto+ o# th! ch!cG. (a* !" ho$" is K1=.00. Ta "at! is 33L. John is a #$%% ti+!!+%o*!! o"Ging 40 ho$"s !" !!G. ! g!ts aid !&!"* oth!" !!G.

3. Sto"! th! na+!s, !ights, h!ights and ag!s o# th"!! !o%! in &a"ia'%!s. ("int a ta'%! ithtit%!s and th! na+!s, !ights, h!ights and ag!s o# a%% th"!! !o%!. )t th! 'otto+ o# th!ta'%!, "int th! a&!"ag! !ights, h!ights and ag!s. 9E!"4H3.'as;

4. )ss$+! that a &id!osto"! !+%o*!! o"Gs 50 ho$"s d$"ing a a* !"iod. Th! !+%o*!! is aid K5.50 #o" th! #i"st 40 ho$"s. Sh! g!ts ti+!andaha%# a* #o" th! #i"st #i&! ho$"s o&!"40. Sh! g!ts aid do$'%! ti+! #o" ho$"s o&!" 45. )ss$+ing a =

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