So even when you forget the order of precedence you can. The parentheses used once cant be considered twice for forming the pair. In mathematics and computer programming the order of operations or operator precedence is a collection of rules that reflect conventions about which procedures to perform first in order to evaluate a given mathematical expression.
Parentheses are a pair of brackets that tell you what to solve first.
So the result of 9991000 is still 0. As far as the C language is concerned anything happening within parentheses is evaluated first in any equation. Parentheses are a pair of brackets that tell you what to solve first. Parentheses are a very important because they can change the answer to your equation.