➕ Let's Understand Operators & Expressions 👨💻🔥
After variables and data types, the next important programming concept is understanding operators and expressions.
These are used to perform calculations, compare values, assign data, and create logical conditions.
🧠 1. What is an Operator?
An operator is a symbol or keyword that tells the computer to perform an operation.
For example:
a = 10
b = 5
result = a + b
Here, "+" is an operator used for addition.
➕ 2. Arithmetic Operators
Arithmetic operators are used for mathematical calculations.
Common operators include:
"+" → Addition
"-" → Subtraction
"" → Multiplication
"/" → Division
"%" → Remainder
"*" → Power
Example:
a = 10
b = 3
print(a + b)
print(a - b)
print(a * b)
print(a / b)
print(a % b)
These operators are commonly used in calculations and data processing.
📝 3. Assignment Operators
Assignment operators are used to assign values to variables.
x = 10
x += 5
After this:
x = 15
Common assignment operators:
"="
"+="
"-="
"*="
"/="
They make it easier to update existing values.
🔍 4. Comparison Operators
Comparison operators compare two values and produce a Boolean result such as "True" or "False".
a = 10
b = 5
print(a > b)
print(a == b)
print(a != b)
Common comparison operators:
"==" → Equal to
"!=" → Not equal to
">" → Greater than
"<" → Less than
">=" → Greater than or equal to
"<=" → Less than or equal to
🧠 5. Logical Operators
Logical operators are used to combine or modify conditions.
The most common ones are:
"and" → Both conditions must be true
"or" → At least one condition must be true
"not" → Reverses the result
Example:
age = 25
has_id = True
print(age >= 18 and has_id)
The result is:
True
🔤 6. String Operators
Operators can also be used with text.
For example:
first = "Hello"
second = "World"
print(first + " " + second)
Output:
Hello World
The "+" operator joins strings together.
In languages such as Python, "*" can also repeat a string:
print("Hi " * 3)
Output:
Hi Hi Hi
🧩 7. What is an Expression?
An expression is a combination of values, variables, and operators that produces a result.
Example:
x = 10
y = 5
result = x * y + 2
The expression:
x * y + 2
produces the value "52".
Expressions are everywhere in programming.
📌 8. Operator Precedence
When an expression contains multiple operators, programming languages follow rules that determine which operation happens first.
For example:
result = 10 + 5 * 2
Multiplication happens before addition.
So the result is:
20
not "30".
Using parentheses makes the intended order clear:
result = (10 + 5) * 2
Now the result is:
30
🌍 9. Operators Across Languages
The syntax can change slightly between languages, but many fundamental operators are similar.
For example, addition:
Python:
a + b
JavaScript:
a + b
Java:
``java
a + b``
C++:
a + b
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