For loop execution model in C Sharp (C#) - Step-by-Step Execution

Concept Flow - For loop execution model

Initialize i = 0

↓

Check: i < 3?

No→EXIT

Yes↓

Execute loop body

↓

Update: i = i + 1

↩Back to Check

The for loop starts by setting i to 0, then checks if i is less than 3. If yes, it runs the loop body, then increases i by 1 and repeats. If no, it stops.

Execution Sample

C Sharp (C#)

for (int i = 0; i < 3; i++)
{
    Console.WriteLine(i);
}

This code prints numbers 0, 1, and 2 using a for loop.

Execution Table

Step	i	Condition (i < 3)	Action	Output
1	0	True	Print 0	0
2	1	True	Print 1	1
3	2	True	Print 2	2
4	3	False	Exit loop

💡 i reaches 3, condition 3 < 3 is False, loop stops

Variable Tracker

Variable	Start	After 1	After 2	After 3	Final
i	0	1	2	3	3

Key Moments - 2 Insights

Why does the loop stop when i equals 3?

Because the condition i < 3 becomes false at step 4 in the execution_table, so the loop exits.

When is the value of i increased?

i is increased after executing the loop body, as shown between steps 1 to 2, 2 to 3, and 3 to 4 in the variable_tracker.

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of i at step 3?

A 2

B 3

C 1

D 0

💡 Hint

Check the 'i' column in the execution_table at step 3.

At which step does the loop condition become false?

A Step 2

B Step 3

C Step 4

D Step 1

💡 Hint

Look at the 'Condition (i < 3)' column in the execution_table.

If the loop condition changed to i < 2, how many times would the loop body run?

A 1 time

B 2 times

C 3 times

D 0 times

💡 Hint

Refer to the variable_tracker and how many times i satisfies the condition.

Concept Snapshot

for (int i = 0; i < limit; i++)
{
  // code runs while condition true
}

1. Initialize i
2. Check condition
3. Run body if true
4. Increment i
5. Repeat or exit

Full Transcript

This visual execution shows how a for loop works in C#. It starts by setting i to 0. Then it checks if i is less than 3. If yes, it runs the loop body and prints i. After that, it increases i by 1. This repeats until i is 3, when the condition becomes false and the loop stops. The execution_table shows each step with i's value, condition check, action, and output. The variable_tracker shows how i changes after each iteration. Key moments explain why the loop stops and when i increases. The quiz tests understanding of i's value at steps, when the loop ends, and how changing the condition affects the loop count.