For loop execution model in C Sharp (C#) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of a simple for loop with increment

What is the output of the following C# code?

C Sharp (C#)

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

A 012

B 123

C 321

D 0 1 2

💡 Hint

Remember the loop starts at 0 and runs while i is less than 3.

The loop starts at 0 and runs while i is less than 3, printing i each time without spaces. So it prints 0, then 1, then 2, resulting in '012'.

❓ Predict Output

intermediate

For loop with break statement output

What will be printed by this C# code?

C Sharp (C#)

for (int i = 0; i < 5; i++)
{
    if (i == 3) break;
    Console.Write(i);
}

A 012

B 01234

C 0123

D 345

💡 Hint

The loop stops when i equals 3.

The loop prints i starting from 0. When i reaches 3, the break stops the loop before printing 3. So output is '012'.

❓ Predict Output

advanced

For loop with multiple variables and complex condition

What is the output of this C# code snippet?

C Sharp (C#)

for (int i = 0, j = 5; i < j; i++, j--)
{
    Console.Write(i + j);
}

A 1010

B 57

C 59

D 555

💡 Hint

Add i and j each loop iteration and print the sum.

Loop runs while i < j. Iterations: 1) i=0, j=5 sum=5 2) i=1, j=4 sum=5 3) i=2, j=3 sum=5 After third iteration, i=3, j=2 stops loop. Output is '555'.

❓ Predict Output

advanced

For loop with continue statement effect

What will be the output of this C# code?

C Sharp (C#)

for (int i = 0; i < 5; i++)
{
    if (i % 2 == 0) continue;
    Console.Write(i);
}

A 1357

B 135

C 13

D 24

💡 Hint

The continue skips even numbers.

The loop skips printing when i is even (0,2,4). It prints only odd i values less than 5: 1 and 3. So output is '13'.

🧠 Conceptual

expert

Number of iterations in nested for loops

How many times will the innermost statement execute in this nested loop?

C Sharp (C#)

for (int i = 1; i <= 3; i++)
{
    for (int j = i; j <= 3; j++)
    {
        Console.WriteLine(i * j);
    }
}

A 12

B 6

C 3

D 9

💡 Hint

Count how many times the inner loop runs for each i.

When i=1, j runs 1 to 3 → 3 times When i=2, j runs 2 to 3 → 2 times When i=3, j runs 3 to 3 → 1 time Total = 3 + 2 + 1 = 6 times.