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ARITHMETIC OPERATORS &
ARITHMETIC EXPRESSIONS
Arithmetic OperatorsMeaningMeaningOperatorOperator
AdditionAddition
SubtractionSubtraction
MultiplicationMultiplication
DivisionDivision
ModulusModulus
++
--
**
//
%%
TypeType
BinaryBinary
BinaryBinary
BinaryBinary
BinaryBinary
BinaryBinary
Arithmetic ExpressionsAlgebraic Exp.Algebraic Exp. C++ ExpressionC++ Expression
f + 7
p - c
bx
r mod s
f + 7
p - c
b * x
x / y
r % s
x/y or x y
RegWages
?.?
OTWages
?.?
OTHours
10
RegHours
40.0OTPay
27.78
BasePay
18.25
TotalWages
?.?
#include <iostream.h>#include <iostream.h>
void main ()void main (){ double RegWages, BasePay = 18.25;{ double RegWages, BasePay = 18.25; double RegHours = 40.0;double RegHours = 40.0; double OTWages, OTPay = 27.78;double OTWages, OTPay = 27.78; double OTHours = 10;double OTHours = 10; double TotalWages;double TotalWages;
Basic usage of operators
RegWages
?.?
OTWages
?.?
OTHours
10
RegHours
40.0
OTPay
27.78
BasePay
18.25
TotalWages
?.?
277.8
1007.8
RegWages = BasePay * RegHours;RegWages = BasePay * RegHours; OTWages = OTPay * OTHours;OTWages = OTPay * OTHours; TotalWages = RegWages + OTWages;TotalWages = RegWages + OTWages; cout << “Wages for this week are $ ”cout << “Wages for this week are $ ” << TotalWages ;<< TotalWages ; }} 730.0
Precedence of OperationsOperatorOperator(s)(s) Operation(s)Operation(s)
( )
* , / , or %
+ or -
Parentheses
MultiplicationDivisionModulus
AdditionSubtraction
How precedence works
x = ( 3 + 8 ) / 3 * 2 + 5 % 3
x = ? / 3
x = 3 * 2
* 2 + 5 % 3
+ 5 % 3
x = + 5 % 36
x =
x =
6 + 2
8
11
Compound Operators
+=+=-- = =
*=*=
%=%=
x = x + 5;x = x + 5;
y = y - 2;y = y - 2;
z = z * 10;z = z * 10;
a = a / ba = a / b
c = c % 3;c = c % 3;
/= /=
x += 5;x += 5;
y y -- = 2; = 2;
z *= 10;z *= 10;
c %= 3;c %= 3;
a /= b; a /= b;
The Typecast Operator#Include <iostream.h>void main (){ int Months, Books;
double PerMonth;cout << “How many books do”
<<“you plan to read?”;cin >> Books;cout << “ How many months will”
<<“it take you to read them?”;cin >> Months;
PerMonth = static_cast <double> (Books) / Months;cout << “That is” << PerMonth” <<“books per month.\n;
}
The Typecast Operator#Include <iostream.h>void main (){ int Months, Books;
double PerMonth;cout << “How many books do” << “you plan to read?”;cin >> Books;cout << “ How many months will” << “it take you to read them?”;cin >> Months;
PerMonth = static_cast <double> (Books) / Months;cout << “That is” << PerMonth << “books per month.\n”;
}
The Typecast Operator
#include <iostream.h>void main (){
int Number = 65;cout << Number << endl;
// C method of type castingcout << char(Number) << endl;
}
cout << (a + 5);
Expressions with a value
Statement Screen Outputcout << (a + b); 11cout << (b * 2); 14cout << (b + (a*2)); 15cout << (a = 6); 6
Expressions with a value
Assume a is 4 and b is 7
Duo
?510
Unus
?59
Tres
?511
3
1
3_11_1_
# include <iostream.h># include <iostream.h>void main ()void main (){ int Unus, Duo, Tres;{ int Unus, Duo, Tres; Unus = Duo = Tres = 5;Unus = Duo = Tres = 5; Unus += 4;Unus += 4; Duo *= 2;Duo *= 2; Tres -= 4;Tres -= 4; Unus /= 3;Unus /= 3; Duo += Tres;Duo += Tres; cout << Unus << endl;cout << Unus << endl; cout << Duo << endl;cout << Duo << endl; cout << Tres << endl;cout << Tres << endl; }}
Unusual
?
Strange
?
Mystery
?102 5
2 _5 _10 _
# include <iostream.h># include <iostream.h>void main ()void main () { int Unusual, Mystery, Strange;{ int Unusual, Mystery, Strange; cout << (Unusual = 2) << endl;cout << (Unusual = 2) << endl; cout << (Strange = Unusual + 3) << endl;cout << (Strange = Unusual + 3) << endl; cout << (Mystery = Strange * 2) cout << (Mystery = Strange * 2) << endl;<< endl;
Unusual
?
Strange
?
Mystery
?102 5
2 _5 _10 _2 _5 _10 _
cout << Unusual << endl;cout << Unusual << endl; cout << Strange << endl;cout << Strange << endl; cout << Mystery << endl;cout << Mystery << endl; }}
What is this program’s output#include <iostream.h> #include <iostream.h>
void main ()void main (){ int X = 0, Y = 2;{ int X = 0, Y = 2; X = Y * 4;X = Y * 4; cout << X << endl << Y << endl;cout << X << endl << Y << endl; }}
82_
Write assignment statements
A) AddsA) Adds 2 2 to to A A and stores the and stores the result inresult in B. B.
B = A + 2B = A + 2
Write assignment statements
B) MultipliesB) Multiplies B B times times 4 4 and and stores the result instores the result in A A..
A = B * 4;A = B * 4;
Write assignment statements
C) DividesC) Divides A A byby 3.14 3.14 and stores and stores the result inthe result in B B..
B = A / 3.14;B = A / 3.14;
Write assignment statements
D) SubtractsD) Subtracts 8 8 fromfrom B B and and stores the result instores the result in A. A.
A = B - 8;A = B - 8;
What is this program’s output void main ()void main (){ { int A, X = 23;int A, X = 23; A = X % 2;A = X % 2; cout << X << endl << A << endl;cout << X << endl << A << endl; }}
231_
