Unary operators in C

Unary Operators
Operator requires operands to perform its operation. Unary operators are those, which takes one operand to perform its task.
Unary + and –
These operators should not be misinterpreted as addition and subtraction operators. These are unary + and –, used to make significant positive or negative. For example -3, +4, -345 etc
Increment Operator
• It increments the value of the operand by 1 (one).
• The operand must be a variable.
Example
int main()
{
int x=5;
x++;
printf("%d ",x);
++x;
printf("%d ",x);
return(0);
}
Output
6 7
• The value of variable x is initialized to 5.
• In x++, x is an operand and ++ is an operator. An operator is better known as post-increment.
• x++ increases the value of variable x by 1, that is value becomes 6
• printf(“%d “,x); prints 6
• In ++x, an operator is better known as pre-increment operator
• ++x again increases the value by 1, that is it becomes 7
• printf(“%d “,x); prints 7
The job of pre-increment and post-increment operators are the same but there is a difference in priority. Pre-increment has higher priority than post-increment. In fact, post-increment has the least priority among all the operators.
Example
int main()
{
int x=5,y;
y=x++;
printf("%d %d",x,y);
return(0);
}
Output
6 5
There are two operators in an expression y=x++. The assignment operator (=) has higher priority than post-increment operator, therefore, the value of x is copied to variable y. The value of y becomes 5. Now post-increment operator increases the value of variable x by 1. The variable x becomes 6.