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Unary operators in C++
Unary operator are operators that act upon a single operand to produce a new value. The unary operators are as follows −
- Indirection operator (*) - It operates on a pointer variable, and returns an l-value equivalent to the value at the pointer address. This is called "dereferencing" the pointer.
- Address-of operator (&) - The unary address-of operator (&) takes the address of its operand. The operand of the address-of operator can be either a function designator or an l-value that designates an object that is not a bit field and is not declared with the register storage-class specifier.
- Unary plus operator (+) - The result of the unary plus operator (+) is the value of its operand. The operand to the unary plus operator must be of an arithmetic type.
- Unary negation operator (-) - The - (unary minus) operator negates the value of the operand. The operand can have any arithmetic type. The result is not an lvalue.
- Logical negation operator (!) - The logical negation operator (!) reverses the meaning of its operand. The operand must be of arithmetic or pointer type (or an expression that evaluates to arithmetic or pointer type). The operand is implicitly converted to type bool .
- One's complement operator (~) - The one's complement operator, sometimes called the "bitwise complement" or "bitwise NOT" operator, produces the bitwise one's complement of its operand. The operand must be of integral type.
- Prefix increment operator (++) - The prefix increment operator ( ++ ) adds one to its operand; this incremented value is the result of the expression. The operand must be an l-value not of type const. The result is an l-value of the same type as the operand.
- Prefix decrement operator (--) - The prefix decreament operator ( -- ) subtracts one from its operand; this decreamented value is the result of the expression. The operand must be an l-value not of type const. The result is an l-value of the same type as the operand.
- Cast operator () - A type cast provides a method for explicit conversion of the type of an object in a specific situation. The compiler treats cast-expression as type type-name after a type cast has been made.
- sizeof operator - It is a compile time unary operator which can be used to compute the size of its operand.
- new operator - It is a memory allocation operator that is used to allocate memory dynamically.
- delete operator - It is a memory allocation operator that is used to deallocate memory that was dynamically allocated.
These operators have right-to-left associativity. Unary expressions generally involve syntax that precedes a postfix or primary expression.
Example
Let's look at an example of the -(minus) and casting() unary operators.
#include<iostream>
using namespace std;
int main() {
int x;
float y = 1.23;
x = (int) y;
x = -x;
cout << x;
return 0;
}Output
This gives the output −
-1
Updated on: 11-Feb-2020
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