Arithmetic operators in C Sharp (C#) - Step-by-Step Execution

Concept Flow - Arithmetic operators

Start

↓

Read operands

↓

Choose operator (+, -, *, /, %)

↓

Perform calculation

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Store/Display result

↓

End

This flow shows how arithmetic operators take two numbers, perform the chosen operation, and produce a result.

Execution Sample

C Sharp (C#)

int a = 10;
int b = 3;
int sum = a + b;
int diff = a - b;
int prod = a * b;
int div = a / b;
int mod = a % b;

This code calculates sum, difference, product, division, and remainder of two numbers.

Execution Table

Step	Operation	Operands	Calculation	Result
1	Addition	a=10, b=3	10 + 3	13
2	Subtraction	a=10, b=3	10 - 3	7
3	Multiplication	a=10, b=3	10 * 3	30
4	Division	a=10, b=3	10 / 3	3 (integer division)
5	Modulo	a=10, b=3	10 % 3	1

💡 All operations done, results stored in variables.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	After Step 5
a	10	10	10	10	10	10
b	3	3	3	3	3	3
sum	undefined	13	13	13	13	13
diff	undefined	undefined	7	7	7	7
prod	undefined	undefined	undefined	30	30	30
div	undefined	undefined	undefined	undefined	3	3
mod	undefined	undefined	undefined	undefined	undefined	1

Key Moments - 3 Insights

Why does division 10 / 3 result in 3 and not 3.333?

Because both operands are integers, C# performs integer division which discards the decimal part, as shown in step 4 of the execution_table.

What does the modulo operator (%) do?

It gives the remainder after division. For example, 10 % 3 equals 1, as shown in step 5 of the execution_table.

Are the original variables 'a' and 'b' changed by the operations?

No, 'a' and 'b' keep their original values throughout, as seen in the variable_tracker where their values remain 10 and 3.

Visual Quiz - 3 Questions

Look at the execution_table at step 3. What is the result of multiplication?

A 13

B 30

C 7

D 3

💡 Hint

Check the 'Result' column for step 3 in the execution_table.

At which step does the variable 'diff' get its value?

A Step 2

B Step 4

C Step 1

D Step 5

💡 Hint

Look at the variable_tracker row for 'diff' and see when it changes from undefined.

If 'a' was 11 instead of 10, what would be the result of 'mod' at step 5?

A 1

B 0

C 2

D 3

💡 Hint

Modulo is remainder of division; check 11 % 3.

Concept Snapshot

Arithmetic operators in C#:
+ addition
- subtraction
* multiplication
/ division (integer if both operands int)
% modulo (remainder)
Operands must be numbers; integer division discards decimals.

Full Transcript

This lesson shows how arithmetic operators work in C#. We start with two numbers, a and b. We add, subtract, multiply, divide, and find the remainder using +, -, *, /, and % operators. Each operation uses the values of a and b and stores the result in a new variable. Integer division discards decimals, so 10 / 3 equals 3. The modulo operator gives the remainder, so 10 % 3 equals 1. The original numbers a and b do not change during these operations.