IT1907
02 Handout 2 *Pr operty of STI
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Operators and Expressions
Operators and Expressions
Operators are the symbols that represent a specific mathematical or logical processi ng in programming. Ope rators spe ci fy which
operations to perform on operands. The following are some of the operators used in C#:
• Arithmetic Operators
• Logi cal Operators
• Relational Operators
• Assignment Ope rators
Arithmeti c Operators – These are operators used in performing mathematical ope rations on numerical values. Table 1 shows
the basic arithmetic operators on C#.
Assume the following variable declarations: int a = 11, b = 5;
Operator
Description
Exampl e
Return value
+
Adds two (2) operands
a + b
16
-
Subtracts the second operand from the first operand
a – b
6
*
Multiplies both operands
a * b
55
/
Divides the first operand by second operand
a / b
2
%
Modulus operator; returns the remainder after dividing first operand by second
operand
a % b
1
Table 1. C# ari thmeti c oper ator s (Gaddis, 2016)
Relational Ope rators – These are used to determine the relationship between operands of numeric values and ge nerate a
decision on that base. These return Boolean values true and false. Table 2 shows the re lational operators on C#.
Assume the following variable declarations: int a = 11, b = 5;
Operator
Description
Exampl e
Return value
>
Determines if the value of the fi rst operand is greater than the value of the secon d
operand—if yes, it return s true; otherwise, false.
a > b
true
<
Determines if the value of the first operand is less than the value of the se cond
operand—if yes, it return s true; otherwise, false.
a < b
false
>=
Determines if the value of the first operand is greate r than or equal to the value of
the second operand—if yes, it returns true; otherwise, false.
a >= b
true
<=
Determines if the value of the fi rst operand i s less than or equal to the value of the
second operand—if yes, it re turns true; otherwise, false.
a <= b
false
==
Determines if the two (2) operands are equal or not—if the values are equal, it
return s true; otherwise, false.
a == b
false
!=
Determines if the two (2) operands are e qual or not—if the val ues are not equal, it
return s true; otherwise, false.
a != b
true
Table 2. C# relational operators (Gaddis, 2016)
Logical Operators – These are operato rs used in perf orming logical operation. These operate on logical expressi ons and returns
a Boole an val ue. Table 3 shows the logical operators on C#.
Assume the following variable declarations: bool A = true, B = false;
Operator
Description
Exampl e
Return value
&&
Logical AND op erator. This returns true only if both operands are true; othe r wise,
false.
A && B
false
||
Logical OR operator. This returns true if one (1) of the two (2) operands is true;
otherwise, false.
A || B
true
^
Logical XOR operator. This returns true if on ly one (1) operand is true; otherwise,
false.
A ^ B
true
!
Logical NOT operator. This reve rses the val ue of a Bool ean variable. If the value of
the Boolean variable is true, the NOT operator will make it false and vice versa.
!A
false
Table 3. C# logical operators (Gaddis, 2016)
