Download Mathematical Operators

Mathematical Operators
You are already familiar with the add, subtract, multiply and divide operators from math class. In programming, the symbols for multiply and divide are a little different. For multiplication use
the star symbol * and for divide use the forward slash symbol /. The computer intrepreter
follows the same rules for "order of operations". - PEMDAS
- Parentheses have the highest precedence and can be used to force an expression to
evaluate in the order you want. Since expressions in parentheses are evaluated first, 2 * (3 - 1)
is 4, and (1 + 1)**(5 - 2) is 8. You can also use parentheses to make an expression easier to
read, as in (60 * 100) / 10, even if it doesn’t change the result.
- Exponentiation has the next highest precedence.
If you want the computer compute 3 2 , it would be coded as: 3**2
- Multiplication and Division have the same precedence, which is higher than Addition or
Subtraction.
- Addition and Subtraction 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. For example,
100 / (2 * 5) is 10 not 250
* Special Mathematical Functions:
- pi, sine, cosine, tangent, are built into the Python math library. These functions may be
used in any Python code, but will require linking to the library by inserting
from math
import*
at the
top of your script. Try googling (python math library). Concatenation of Strings and Mathematical Operators
Python has the capability of performing mathematical operations and concatenating them with a
string. Use a comma between the string expression and the mathematical expression. Parentheses are added around the mathematical operation to denote that these two numbers
will be added together. Using parentheses is always a good way to eliminate errors.
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Mathematical Operators
print "The sum of 4 + 4 is ", (4+4)
print "If the DVD costs $10 and I only have $3, I am short",(10-3),"dollars."
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