Curly brackets after for statement

Question

I\'m a newbie. Wrote a code to print sum of number from 1 to 10. Here\'s what happened;

for(a = 1; a<=10; a++)
sum += a;
cout<

<

Answer 1

because:

for(a = 1; a<=10; a++)
sum += a;
cout<

is like saying:

for(a = 1; a<=10; a++) {
    sum += a;
}
cout<

When you do this, it prints the number once rather than upon each iteration.