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The *, /, %, +, and operators are called the arithmetic operators.
multiplicativeexpression:
unaryexpression
multiplicativeexpression * unaryexpression
multiplicativeexpression / unaryexpression
multiplicativeexpression % unaryexpression
additiveexpression:
multiplicativeexpression
additiveexpression + multiplicativeexpression
additiveexpression multiplicativeexpression
For an operation of the form x * y, binary operator overload resolution (§7.2.4) is applied to select a specific operator implementation. The operands are converted to the parameter types of the selected operator, and the type of the result is the return type of the operator.
The predefined multiplication operators are listed below. The operators all compute the product of x and y.
Integer multiplication:
int
operator *(int x, int y);
uint operator *(uint x, uint y);
long operator *(long x, long y);
ulong operator *(ulong x, ulong y);
In a checked context, if the product is outside the range of the result type, a System.OverflowException is thrown. In an unchecked context, overflows are not reported and any significant highorder bits of the result are discarded.
Floatingpoint multiplication:
float
operator *(float x, float y);
double operator *(double x, double y);
The product is computed according to the rules of
IEEE 754 arithmetic. The following table lists the results of all possible
combinations of nonzero finite values, zeros, infinities, and

+y 
y 
+0 
0 
+∞ 
∞ 

+x 
+z 
z 
+0 
0 
+∞ 
∞ 

x 
z 
+z 
0 
+0 
∞ 
+∞ 

+0 
+0 
0 
+0 
0 



0 
0 
+0 
0 
+0 



+∞ 
+∞ 
∞ 


+∞ 
∞ 

∞ 
∞ 
+∞ 


∞ 
+∞ 









Decimal multiplication:
decimal operator *(decimal x, decimal y);
If the resulting value is too large to represent in the decimal format, a System.OverflowException is thrown. If the result value is too small to represent in the decimal format, the result is zero.
For an operation of the form x / y, binary operator overload resolution (§7.2.4) is applied to select a specific operator implementation. The operands are converted to the parameter types of the selected operator, and the type of the result is the return type of the operator.
The predefined division operators are listed below. The operators all compute the quotient of x and y.
Integer division:
int
operator /(int x, int y);
uint operator /(uint x, uint y);
long operator /(long x, long y);
ulong operator /(ulong x, ulong y);
If the value of the right operand is zero, a System.DivideByZeroException is thrown.
The division rounds the result towards zero, and the absolute value of the result is the largest possible integer that is less than the absolute value of the quotient of the two operands. The result is zero or positive when the two operands have the same sign and zero or negative when the two operands have opposite signs.
If the left operand is the maximum negative int or long and the right operand is 1, an overflow occurs. In a checked context, this causes a System.OverflowException to be thrown. In an unchecked context, the overflow is not reported and the result is instead the value of the left operand.
Floatingpoint division:
float
operator /(float x, float y);
double operator /(double x, double y);
The quotient is computed according to the rules of
IEEE 754 arithmetic. The following table lists the results of all possible
combinations of nonzero finite values, zeros, infinities, and

+y 
y 
+0 
0 
+∞ 
∞ 

+x 
+z 
z 
+∞ 
∞ 
+0 
0 

x 
z 
+z 
∞ 
+∞ 
0 
+0 

+0 
+0 
0 


+0 
0 

0 
0 
+0 


0 
+0 

+∞ 
+∞ 
∞ 
+∞ 
∞ 



∞ 
∞ 
+∞ 
∞ 
+∞ 











Decimal division:
decimal operator /(decimal x, decimal y);
If the value of the right operand is zero, a System.DivideByZeroException is thrown. If the resulting value is too large to represent in the decimal format, a System.OverflowException is thrown. If the result value is too small to represent in the decimal format, the result is zero.
For an operation of the form x % y, binary operator overload resolution (§7.2.4) is applied to select a specific operator implementation. The operands are converted to the parameter types of the selected operator, and the type of the result is the return type of the operator.
The predefined remainder operators are listed below. The operators all compute the remainder of the division between x and y.
Integer remainder:
int
operator %(int x, int y);
uint operator %(uint x, uint y);
long operator %(long x, long y);
ulong operator %(ulong x, ulong y);
The result of x % y is the value produced by x (x / y) * y. If y is zero, a System.DivideByZeroException is thrown. The remainder operator never causes an overflow.
Floatingpoint remainder:
float
operator %(float x, float y);
double operator %(double x, double y);
The following table lists the results of all
possible combinations of nonzero finite values, zeros, infinities, and

+y 
y 
+0 
0 
+∞ 
∞ 

+x 
+z 
+z 


x 
x 

x 
z 
z 


x 
x 

+0 
+0 
+0 


+0 
+0 

0 
0 
0 


0 
0 

+∞ 







∞ 















Decimal remainder:
decimal operator %(decimal x, decimal y);
If the value of the right operand is zero, a System.DivideByZeroException is thrown. If the resulting value is too large to represent in the decimal format, a System.OverflowException is thrown. If the result value is too small to represent in the decimal format, the result is zero.
For an operation of the form x + y, binary operator overload resolution (§7.2.4) is applied to select a specific operator implementation. The operands are converted to the parameter types of the selected operator, and the type of the result is the return type of the operator.
The predefined addition operators are listed below. For numeric and enumeration types, the predefined addition operators compute the sum of the two operands. When one or both operands are of type string, the predefined addition operators concatenate the string representation of the operands.
Integer addition:
int
operator +(int x, int y);
uint operator +(uint x, uint y);
long operator +(long x, long y);
ulong operator +(ulong x, ulong y);
In a checked context, if the sum is outside the range of the result type, a System.OverflowException is thrown. In an unchecked context, overflows are not reported and any significant highorder bits of the result are discarded.
Floatingpoint addition:
float
operator +(float x, float y);
double operator +(double x, double y);
The sum is computed according to the rules of IEEE
754 arithmetic. The following table lists the results of all possible
combinations of nonzero finite values, zeros, infinities, and

y 
+0 
0 
+∞ 
∞ 

x 
z 
x 
x 
+∞ 
∞ 

+0 
y 
+0 
+0 
+∞ 
∞ 

0 
y 
+0 
0 
+∞ 
∞ 

+∞ 
+∞ 
+∞ 
+∞ 
+∞ 


∞ 
∞ 
∞ 
∞ 

∞ 








Decimal addition:
decimal operator +(decimal x, decimal y);
If the resulting value is too large to represent in the decimal format, a System.OverflowException is thrown. If the result value is too small to represent in the decimal format, the result is zero.
Enumeration addition. Every enumeration type implicitly provides the following predefined operators, where E is the enum type, and U is the underlying type of E:
E
operator +(E x, U y);
E operator +(U x, E y);
The operators are evaluated exactly as (E)((U)x + (U)y).
String concatenation:
string
operator +(string x, string y);
string operator +(string x, object y);
string operator +(object x, string y);
The binary + operator performs string concatenation when one or both operands are of type string. If an operand of string concatenation is null, an empty string is substituted. Otherwise, any nonstring argument is converted to its string representation by invoking the virtual ToString() method inherited from type object. If ToString() returns null, an empty string is substituted.
The result of the string concatenation operator is a string that consists of the characters of the left operand followed by the characters of the right operand. The string concatenation operator never returns a null value. A System.OutOfMemoryException may be thrown if there is not enough memory available to allocate the resulting string.
Delegate combination. Every delegate type implicitly provides the following predefined operator, where D is the delegate type:
D operator +(D x, D y);
The binary + operator performs delegate combination when both operands are of some delegate type D. If the first operand is null, the result of the operation is the value of the second operand (even if that operand is also null). Otherwise, if the second operand is null, then the result of the operation is the value of the first operand. Otherwise, the result of the operation is a new delegate instance that, when invoked, invokes the first operand and then invokes the second operand.
For an operation of the form x y, binary operator overload resolution (§7.2.4) is applied to select a specific operator implementation. The operands are converted to the parameter types of the selected operator, and the type of the result is the return type of the operator.
The predefined subtraction operators are listed below. The operators all subtract y from x.
Integer subtraction:
int
operator (int
x, int y);
uint operator (uint
x, uint y);
long operator (long
x, long y);
ulong operator (ulong
x, ulong y);
In a checked context, if the difference is outside the range of the result type, a System.OverflowException is thrown. In an unchecked context, overflows are not reported and any significant highorder bits of the result are discarded.
Floatingpoint subtraction:
float
operator (float
x, float y);
double operator (double
x, double y);
The difference is computed according to the rules of
IEEE 754 arithmetic. The following table lists the results of all possible
combinations of nonzero finite values, zeros, infinities, and

y 
+0 
0 
+∞ 
∞ 

x 
z 
x 
x 
∞ 
+∞ 

+0 
y 
+0 
+0 
∞ 
+∞ 

0 
y 
0 
+0 
∞ 
+∞ 

+∞ 
+∞ 
+∞ 
+∞ 

+∞ 

∞ 
∞ 
∞ 
∞ 
∞ 









Decimal subtraction:
decimal operator (decimal x, decimal y);
If the resulting value is too large to represent in the decimal format, a System.OverflowException is thrown. If the result value is too small to represent in the decimal format, the result is zero.
Enumeration subtraction. Every enumeration type implicitly provides the following predefined operator, where E is the enum type, and U is the underlying type of E:
U operator (E x, E y);
This operator is evaluated exactly as (U)((U)x (U)y). In other words, the operator computes the difference between the ordinal values of x and y, and the type of the result is the underlying type of the enumeration.
E operator (E x, U y);
This operator is evaluated exactly as (E)((U)x y). In other words, the operator subtracts a value from the underlying type of the enumeration, yielding a value of the enumeration.
Delegate removal. Every delegate type implicitly provides the following predefined operator, where D is the delegate type:
D operator (D x, D y);
The binary  operator performs delegate removal when one or both operands are of a delegate type D. If the first operand is null, the result of the operation is null. Otherwise, if the second operand is null, then the result of the operation is the value of the first operand. Otherwise, both operands represent invocation lists (§15.1) having one or more entries, and the result is a new invocation list consisting of the first operands list with the second operands entries removed from it, provided the second operands list is a proper contiguous subset of the firsts. (For determining subset equality, corresponding entries are compared as for the delegate equality operator.) Otherwise, the result is the value of the left operand. Neither of the operands lists is changed in the process. If the second operands list matches multiple subsets of contiguous entries in the first operands list, the rightmost matching subset of contiguous entries is removed. If removal results in an empty list, the result is null.
The example
delegate void D(int x);
class
Test
public static void M2(int i)
}
class
Demo
}shows a variety of delegate subtractions.
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