for loop using c

Its format is:
for (initialization; condition; increase) statement;

its main function is to repeat statement while condition remains true, like the while loop. But in addition, the
for loop provides specific locations to contain an initialization statement and an increase statement. So this
loop is specially designed to perform a repetitive action with a counter which is initialized and increased on each
iteration.
It works in the following way:
1. initialization is executed. Generally it is an initial value setting for a counter variable. This is executed
only once.
2. condition is checked. If it is true the loop continues, otherwise the loop ends and statement is skipped
(not executed).
3. statement is executed. As usual, it can be either a single statement or a block enclosed in braces { }.
4. finally, whatever is specified in the increase field is executed and the loop gets back to step 2.
Here is an example of countdown using a for loop:
// countdown using a for loop
#include <iostream>
using namespace std;
int main ()
{
for (int n=10; n>0; n--) {
cout << n << ", ";
}
cout << "FIRE!\n";
return 0;
}
10, 9, 8, 7, 6, 5, 4, 3, 2, 1, FIRE!
The initialization and increase fields are optional. They can remain empty, but in all cases the semicolon signs
between them must be written. For example we could write: for (;n<10;) if we wanted to specify no initialization
and no increase; or for (;n<10;n++) if we wanted to include an increase field but no initialization (maybe because
the variable was already initialized before).
Optionally, using the comma operator (,) we can specify more than one expression in any of the fields included in
a for loop, like in initialization, for example. The comma operator (,) is an expression separator, it serves to
separate more than one expression where only one is generally expected. For example, suppose that we wanted to
initialize more than one variable in our loop:
for ( n=0, i=100 ; n!=i ; n++, i-- )
{
// whatever here...
}
This loop will execute for 50 times if neither n or i are modified within the loop:

n starts with a value of 0, and i with 100, the condition is n!=i (that n is not equal to i). Because n is increased by
one and i decreased by one, the loop's condition will become false after the 50th loop, when both n and i will be
equal to 50.