Pre -increment vs Post-increment

++i and i++ both increment the value of i by 1 but in a different way. If ++ precedes the variable, it is called pre-increment operator and it comes after a variable, it is called post-increment operator.

Increment in java is performed in two ways,

1. Post-increment(i++)
2. Pre-increment(++i)

Post-Increment (i++):

we use i++ in our statement if we want to use the current value, and then we want to increment the value of i by 1.

Example:

int i = 3;
int a = i++; // a = 3, i = 4

Pre-Increment(++i):

We use ++i in our statement if we want to increment the value of i by 1 and then use it in our statement.

Example:

int i = 3;
int b = ++a; // b = 4, a = 4

Many programming languages such as Java or C offer specialized unary operators for the pre-increment operations:(++operand) and (operand++). Both increment their argument variable by 1, but not the same way.

In particular, if x is an integer variable, and we pre-increment it as a part of a larger expression, the program will first add 1 to x and then evaluate x to the new value as the part of evaluation of the entire expression.

For example:

int x = 4;
int y = (++x) + 100; 
//x = 5, y = 

In contrast, the post-increment alternative will increment x but evaluate it to the old value inside the expression. Only after the expression has been evaluated does x have the new value:

int x = 4;
int y = (x++) + 100;
// x = 5, y = 104

As we can see, x = 5 in both cases, but the final value of y is different.