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Operators and operands
Operators are special symbols that represent computations like addition and multiplication. The values the operator is applied to are called operands.
The operators +, -, *, / and ** perform addition, subtraction, multiplication, division and exponentiation.
The order of evaluation depends on the rules of precedence. The acronym PEMDAS is a useful way to remember the rules:
· Parentheses have the highest precedence
· Exponentiation has the next highest precedence, so 2**1+1 is 3, not 4, and 3*1**3 is 3, not 27.
· Multiplication and Division have the same precedence, which is higher than Addition and Subtraction, which also have the same precedence. So 2*3-1 is 5, not 4, and 6+4/2 is 8, not 5.
· Operators with the same precedence are evaluated from left to right.
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