Math Operators and Expressions in Python and Java
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Operators and Expressions
Math operators - Addition
•
In both languages:
integer + integer = addition, resulting in an integer
float + (integer or float) = addition, resulting in a float
string + string = concatenation between two strings
•
Python:
•
A number and a string cannot be added
•
Java:
•
A number and a string can be added
•
The operation is concatenation
•
The result is always a string
Math operators - Addition
Java
Python
Math operators - Addition
•
Beware of the order of operations.
•
Addition and concatenation have the same order of precedence
•
As such, they are always resolved left to right
Math operators - Multiplication
•
In both languages
•
Multiplying two numbers gives you their product
•
If both numbers are integers, the result is an integer
•
If one of the numbers is a float, the result is a float
•
Python
•
You can multiply a string by an integer
•
The result is that string, repeated that many times
•
print(
“Alice”
* 3) # prints
“AliceAliceAlice”
•
Java
•
You may not multiply strings with numbers
Math operators - Multiplication
Java
Python
Math operators - Division
•
Python
•
Dividing two numbers always gives you a float
•
Java
•
Dividing two integers always gives you an integer, rounded down
•
Dividing an integer and a float always gives you a float
Math operators - Division
Java
Python
Math operators - Power
•
Python
•
We have a power operator
print(2 ** 3) # prints 6
•
Java
•
There is no power operator
•
Must use a Math method
System.out.println(Math.pow(2,3)); // prints 6
Math operators – Floor division
•
Python
•
We have a floor division operator
print(7 // 2.0) # prints 3.0
•
Java
•
There is no floor division operator
•
Must use a Math method
double result = 7 / 2;
System.out.println(Math.floor(result)); // prints 3.0
Comparison operators
Available in both languages
•
Equality (==)
•
Inequality (!=)
•
Greater than (>)
•
Less than (<)
•
Greater than or Equal (>=)
•
Less than or Equal (<=)
Not available in Java
•
in, not in, is, is not
Checking strings for equality in Java
•
Do not use == to check if two strings are equal in Java
•
Use the equals() method instead
Logical operators
Explore the operations like addition, multiplication, division, power, and more in Python and Java. Learn how these operations work with integers, floats, and strings to enhance your understanding of mathematical expressions in programming.
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Presentation Transcript
Module 7 Module 7 Part 2 Part 2 Operators and Expressions
Math operators - Addition In both languages: integer + integer = addition, resulting in an integer float + (integer or float) = addition, resulting in a float string + string = concatenation between two strings Python: A number and a string cannot be added Java: A number and a string can be added The operation is concatenation The result is always a string
Math operators - Addition Java Python
Math operators - Addition Beware of the order of operations. Addition and concatenation have the same order of precedence As such, they are always resolved left to right
Math operators - Multiplication In both languages Multiplying two numbers gives you their product If both numbers are integers, the result is an integer If one of the numbers is a float, the result is a float Python You can multiply a string by an integer The result is that string, repeated that many times print( Alice * 3) # prints AliceAliceAlice Java You may not multiply strings with numbers
Math operators - Multiplication Java Python
Math operators - Division Python Dividing two numbers always gives you a float Java Dividing two integers always gives you an integer, rounded down Dividing an integer and a float always gives you a float
Math operators - Division Python Java
Math operators - Power Python We have a power operator print(2 ** 3) # prints 6 Java There is no power operator Must use a Math method System.out.println(Math.pow(2,3)); // prints 6
Math operators Floor division Python We have a floor division operator print(7 // 2.0) # prints 3.0 Java There is no floor division operator Must use a Math method double result = 7 / 2; System.out.println(Math.floor(result)); // prints 3.0
Comparison operators Available in both languages Equality (==) Inequality (!=) Greater than (>) Less than (<) Greater than or Equal (>=) Less than or Equal (<=) Not available in Java in, not in, is, is not
Checking strings for equality in Java Do not use == to check if two strings are equal in Java Use the equals() method instead
Logical operators Operator name Python syntax Java Syntax Logical NOT not ! Logical AND and && Logical OR or ||
