How do you get a code in C to count down from 5?

This is what the code should do:

"Lift off in T minus

5

4

3

2

1

Blast-off!"

When I run it, it just keeps printing ''Sum = 5'' forever.

Explanation:

Code:

int main (void) {

int sum = 5;

int i;

printf ("Lift off in T minus/n");

for (i = 0; i < 5; i=i+i) {

sum = sum - i;

printf ("sum = %d/n", sum);

}

printf ("Blast-off", sum);

return 0;