I cant understand the FOR LOOP

Question

I can't understand what is FOR Loop. WHAT ARE ITS COMPONENTS? PLEASE EXPLAIN!

Answer 1

For example:

for(int i = 1; i <= 5; i++)
cout << i << endl;

gives us:
1
2
3
4
5

for (int = 1; i <=5;)
cout << i << endl;
1
1
1
1
1
1
1
1
...
The loop is infinite.

Answer 2

for (int i = 1; i <= 5; i++)

The first is initializer of counter.
The second is statement. The loop will continue do until it is true.
The third is changing counter. It is running after each loop.

Answer 3

and what is the importance of 3rd one ?

Answer 4

thanks