C# interview questions with answers on postfix and prefix: – i++ vs ++i Continuous

i++ :- In this scenario first the value is assigned and then increment happens. In the below code snippet first the value of “i” is assigned to “j” and then “i” is incremented.

int1

++i :- In this scenario first the increment is done and then value is assigned. In the below code snippet value of “j” is 2 and value of “i” is also 2.

int2
If you visualize in a pictorial manner below is how it looks like. So i++ is a post fix , it first assigns and then increments. While ++i is a prefix, it first increments and then assigns the value.

int3

Below are some sample code where postfix and prefix fits in.

while (i < 5) //evaluates conditional statement
{
//some logic
++i; //increments i
}

while (i++ < 5) //evaluates conditional statement with i value before increment
{
//some logic
}

int i = 0;
int[] MyArray = new int[2];
MyArray[i++] = 1234; //sets array at index 0 to ‘1234’ and i is incremented
MyArray[i] = 5678; //sets array at index 1 to ‘5678’
int temp = MyArray[–i]; //temp is 1234 

Also see the following c# interview questions video on i++ vs ++i (postfix and prefix).

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