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C# Studies

Operators

Arithmetic Operators

  • + = Addition
  • - = Subtraction
  • * = Multiplication
  • / = Division
  • % = Remainder of the division
int value = 2 + 2; // 4
int value = 2 - 2; // 0
int value = 2 * 2; // 4
int value = 2 / 2; // 1
int value = 2 % 2; // 0

Assignment Operators

  • = = Assigns a value
  • += = Adds a new value to the current value
  • -= = Subtracts a new value from the current value
  • *= = Multiplies the current value by a new value
  • /= = Divides the current value by a new value
int x = 0; // Assigns a value to a variable
x += 5; // same as x = x + 5; and results in x = 5
x -= 1; // same as x = x - 1; and results in x = 4 (5 - 1 = 4)
x *= 10; // same as x = x * 10; and results in 40 (4 * 10 = 40)
x /= 2; // same as x = x / 2; and results in 20 (40 / 2 = 20)

Comparison Operators

Return boolean values

  • == = Equal to
  • != = Not equal to
  • > = Greater than
  • < = Less than
  • >= = Greater than or equal to
  • <= = Less than or equal to
5 == 5; // True
4 != 3; // True
4 != 4; // False
6 > 5; // True
4 < 5; // True
4 <= 4; // True
5 >= 3; // True

Conditional Operators

The conditional operator is a one-line construct to check two values using the ? and : operators, in the following structure:

<condition> ? <if true, returns this value> : <if false, returns this value>

Let’s look at the following example:

int saleAmount = 1001;


int discount = saleAmount > 1000 ? 100 : 50;

In the example above, if the value of saleAmount is greater than 1000, the variable discount receives 100; otherwise it receives 50.

Increment and Decrement Operators

→ We can change the value of a variable every time it is used

In C#, as in any high-level language, we can change the value of a variable every time we use it in a process.

SymbolWhat it does
++Increments by 1
—Decrements by 1
  • We can increment the value before using the variable
int x = 5;
Console.WriteLine(++x); // 6
  • We can increment the value after using the variable
int x = 5;
Console.WriteLine(x++); // 5
Console.WriteLine(x); // 6
  • We can decrement the value before using the variable
int x = 5;
Console.WriteLine(--x); // 4
  • We can decrement the value after using the variable
int x = 5;
Console.WriteLine(x--); // 5
Console.WriteLine(x); // 4

Logical Operators

Return boolean values

Used for conditional operations

  • && = Logical AND
    • All conditions must be true
  • || = Logical OR
    • At least one must be true
  • ! = Logical NOT
    • Negates the value: true becomes false and vice versa
int x = 12;
bool value = (x > 25) && (x < 40); // False
bool value = (x > 25) || (x < 40); // True
bool value = !(x > 25) && (x < 40); // True