Question

Difference between preincrement and postincrement operator in c

Answer 1

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Pre increment operator is used to increment variable value by 1 before assigning the value to the variable. Post increment operator is used to increment variable value by 1 after assigning the value to the variable.

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Answer 2

Before we understand the difference between pre increment and post increment operator,let us see how they are denoted :-

++b is pre increment operator.

b++ is post increment operator.

The common thing between these two operator is that the value of b is increased by 1.

Pre-increment operator :-

Let us see notice these statements.

int a,b;

b = 6;

a = ++b;

What will be the value of a and b after the last statement ?

Notice that we have used pre increment operator. First the value of b is increased by 1(pre-increment) and then a is assigned the value of b.

Hence,

b = 7

a = 7

This is what this operator does, first the value is increased by 1 and then the value is assigned to the corresponding variable.

Post-increment operator :-

Let us see notice these statements.

int a,b;

b = 6;

a = b++;

What will be the value of a and b after the last statement ?

Notice that we have used post increment operator. First the value of a is assigned equal to b and then b is increased by 1.(post increment).

Hence,

a = 6

b = 7

This is what this operator does, first the value of the variable is assigned and then the the value of b is increased by 1.