What is the difference between ++i and i++?

++i is a pre-Increment and i++ is a post-Increment that means ,In a ++i value is incremented first and in i++ value is incremented after a first execution

3 years ago

The major difference between i++ and ++i is that i++ returns the value before it incremented whereas ++i returns the value after it is incremented. In simple terms, i++ returns the original value of i, and then it increments whereas ++i first increments the value and then returns that incremented value.

3 years ago

++i and i++ both are unary operators used for incrementing value by one. ++i is called a pre-increment operator as it first increments the value and then it assigns to variable whereas i++ is a post-increment operator which first assigns the value to the variable and then it increments the value.

#include<stdio.h>

int main()

{

	int i ,j ,x,z;

	i=10;

	j=10;

	x=++i;  //pre-increment 

	z=j++;  //post increment

	printf("the result = %d ",x);

	printf("the result = %d ",z);

	return 0;

}

Run this program and you will find that x has been assigned incremented value whereas z has been assigned the original value.
For loop, pre-increment can be preferred as it takes less time for internal computation.
But in case if you are using the previous value then use the post-increment operator.

3 years ago