Operator precedence and associativity

Q) Explain operator presidency and associativity.

In an expression when there are more the one operator is involved, the evaluation of them is done based on its priority.
In C, every operator has its own priority (importance) this priority is known as the precedence of the operator.
This operator having more precedence will be evaluated first and the remaining will be evaluated later. Consider the following expression:

a = 5 + 6 * 10 ;

Here, the operation * will be performed first since it has higher precedence than +, later+operator will do its task and at the last =will be done.
The priority of each operator in C is given in the following table.

When an expression contains two or more operators of equal priority the tie between them is settled using the associativity of the operators.
Associativity can be two types Left to Right or Right to Left.
Left to Right associativity means that the left operand must be unambiguous. Unambiguous in what sense? It must not be involved in the evaluation of any other sub-expression. Similarly, in cases of Right to left associativity, the right operand must be unambiguous. Let us understand this with an example.

Consider the expression

a = 3 / 2 * 5 ;

Here there is a tie between operators of the same priority, that is between / and *. This tie is settled using the associativity of / and *. But both enjoy left to Right associativity.
The figure shows for each operator which operand is unambiguous and which is not.

Operator	Left	Right	Remark
/	3	2 or 2 * 5	The left operand is unambiguous, Right is not
*	3 / 2 or 2	5	The right operand is unambiguous, Left is not

Since both / and* have L to R associativity and only / has an unambiguous left operand (a necessary condition for L to R associativity) it is performed earlier.
After that * will be operated.