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

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

• ++i will increment the value of i, and then return the incremented value.

   i = 1;
   j = ++i;
   (i is 2, j is 2)
  

• i++ will increment the value of i, but return the original value that i held before being incremented.

   i = 1;
   j = i++;
   (i is 2, j is 1)
  

For a for loop, either works. ++i seems more common, perhaps because that is what is used in K&R.

In any case, follow the guideline prefer ++i over i++ and you wont go wrong.

Theres a couple of comments regarding the efficiency of ++i and i++. In any non-student-project compiler, there will be no performance difference. You can verify this by looking at the generated code, which will be identical.

The efficiency question is interesting… heres my attempt at an answer:
Is there a performance difference between i++ and ++i in C?

As @OnFreund notes, its different for a C++ object, since operator++() is a function and the compiler cant know to optimize away the creation of a temporary object to hold the intermediate value.

i++ is known as Post Increment whereas ++i is called Pre Increment.

i++

i++ is post increment because it increments is value by 1 after the operation is over.

Lets see the following example:

int i = 1, j;
j = i++;

Here value of j = 1 but i = 2. Here value of i will be assigned to j first then i will be incremented.

++i

++i is pre increment because it increments is value by 1 before the operation.
It means j = i; will execute after i++.

Lets see the following example:

int i = 1, j;
j = ++i;

Here value of j = 2 but i = 2. Here value of i will be assigned to j after the i incremention of i.
Similarly ++i will be executed before j=i;.

For your question which should be used in the incrementation block of a for loop? the answer is, you can use any one.. doesnt matter. It will execute your for loop same no. of times.

for(i=0; i<5; i++)
   printf(%d ,i);

And

for(i=0; i<5; ++i)
   printf(%d ,i);

Both the loops will produce same output. ie 0 1 2 3 4.

It only matters where you are using it.

for(i = 0; i<5;)
    printf(%d ,++i);

In this case output will be 1 2 3 4 5.

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

i++: In this scenario first the value is assigned and then increment happens.

++i: In this scenario first the increment is done and then value is assigned

Below is the image visualization and also here is a nice practical video which demonstrates the same.