# Precedence and associativity
**Order of evaluation** refers to the operator `precedence and associativity rules` according to which mathematical expressions are evaluated. 
## Same precedence
Operators in the `same row` have the `same precedence`. The compiler will evaluate them in any order. 

>It may choose another order when the same expression is evaluated again, but this will not affect the evaluated answer. 

## Different precedence
Operators in different rows have different precedence. `Rows are in order of decreasing precedence`. This means that below a given row, any operator in the lower rows will have lower precedence than the operators in the highest row.

# Altering the order
The order of precedence can be altered by using `parentheses` around the parts of the mathematical expression that needs to be evaluated first. 

# Table of the order of evaluation
The order of evaluation in C is illustrated in the following figure:
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#include <stdio.h>

int main() {
  int answer_1 = 0; // stores order evaluated answer
  int answer_2 = 0; // stores left to right evaluation
  
  answer_1 = 2 * 3 + 4 / 2;
  answer_2 = 2 * (3 + 4) / 2;

  printf("Answer with order of evaluation: %d\n", answer_1);
  printf("Answer without order of evaluation: %d\n", answer_2);

  return 0;
}

What is the order of evaluation in C?

In C, operators are evaluated based on their precedence and associativity, with parentheses altering this order.