What will be the output of the following C# code?

static void Main(string[] args)
{
     int i ;
     for (i = 0; i < 5; i++)
     {
         int j = 0;
         j += i; 
         Console. WriteLine(j);
     }
     Console. WriteLine( i * j);
     Console. ReadLine();
}

Understanding the Code:
This C# code uses a for loop to repeat a block of code five times.
Inside the loop, a variable j is declared and initialized to 0 in each iteration.
Then, j is updated by adding the current value of i to it (j += i;).
The value of j is printed to the console in each iteration.
After the loop finishes, the code tries to print i * j. However, this is tricky! The scope of j is only inside the loop. Once the loop finishes, j no longer exists.
Therefore, you will get a compile-time error because j is not accessible outside the loop.

Why other options are incorrect:
Options A, B, and D show possible outputs if the code were to run without error. Since j is out of scope, these outputs are impossible.

The Correct Answer:
The correct answer is C: Compile time error because the variable j is not accessible outside the for loop.