Technologies

C

C Language Unary Operator
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# Increment (++) and Decrement (--) Operators :

# Minus (-) Operator

# Address (&) and Size SizeOf Operators

### Program : This program explains the Sizeof and Address Operators

**Output : **
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CLanguage

Friday, 31 Mar 2017

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Unary Operators include

- Increment (++) and Decrement (--) Operators
- Minus (-) Operator
- Address (&) and Size SizeOf Operators

These operators are **Unary Operators** because they act on only one operand.

**Unary Operators** will be given the highest priority over binary and ternary operators. While evaluating expressions unary operators follow right to left associativity.

Operator |
Description (or) Action |
---|---|

++ | Increment Operator |

-- | Decrement Operator |

- | Minus Operator |

& | Address Operator |

SizeOf | Sizeof Operator |

The operator ++ adds one to its operand, wheras the operator -- subtracts one from its operand.

x = x + 1; can be written as x++

x = x - 1; can be written as x--

x = x - 1; can be written as x--

if ++ and -- are used as suffix to the variable name, then the post increment of decrement operations take place.

If ++ and -- are used as prefix to the variable name, then pre increment/decrement operations take place.

Example : 1

x = 20;

y = 10;

z = x * y++;

x = 20;

y = 10;

z = x * y++;

Here, the current value of y is used for product and after performing the operation, the value of y is incremented.

Result is, z = 20 * 10 = 200;

Example : 2

x = 20;

y = 10;

z = x * ++y;

Example : 2

x = 20;

y = 10;

z = x * ++y;

Here, the value of y is incremented first and then used for the product.

Result is, z = 20 * 11 = 220

Minus Operator is used to indicate or change the algebraic sign of a value.

Example : 1

int x = -50;

int y = -x;

int x = -50;

int y = -x;

First assignment, assigns the value -50 to x and the second assignment assigns the value of 50 to y through x.

The - sign used in this way is called unary oerpator, because it takes only one operand.

The sizeof operator gives the bytes occupied by a variable. The number of bytes occupied varies from variable to variable.

The & (address) operator prints the address of the variable in the memory.

#includemain() { int x = 2; float y = 2; printf("sizeof(x)=%d bytes \n", sizeof(x)); printf("sizeof(y)=%d bytes \n", sizeof(y)); printf("address of x=%u and y = %u", &x, &y); }

sizeof (x) = 2 bytes

sizeof (y) = 4 bytes

Address of x = 4066 and y = 25096

sizeof (y) = 4 bytes

Address of x = 4066 and y = 25096

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CLanguage

Friday, 31 Mar 2017

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