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c#for-loopdifferencebrackets
moji
moji

Reputation: 267

Difference between using brackets in for loop C# and not using it

The output of the following code is different from the ouput from the second code can someone explain the problem?

Code 1:

for(int i = 1; i <= intInput; i++)
{
    for(int j = 1; j<=i; j++)
    {
        Console.Write('+');
        Console.WriteLine();
    }                         
}
if intInput is 4 Ouput is:
+
+
+ 
+

Code 2:

for(int i = 1; i <= intInput; i++)
{
    for(int j = 1; j<=i; j++)
        Console.Write('+');
        Console.WriteLine();                                    
}
if intInput is 4 Ouput is:

+
++
+++
++++

I know how this line of codes works but i dont understand what difference the brackets make on both codes?

Upvotes: 2

Views: 921

Answers (4)

Fuad Teymurov
Fuad Teymurov

Reputation: 73

If alter 1 with i in second loop then it will work same

for (int j = **i**; j <= i; j++)
   Console.Write('+');
   Console.WriteLine();

Upvotes: 0

Soner G&#246;n&#252;l
Soner G&#246;n&#252;l

Reputation: 98810

When you write;

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

Both Console line works until j loops out.

But when you write 

for(int j = 1; j <= i; j++)
    Console.Write('+');
    Console.WriteLine();

Only first Console works until j loops out. That's why second one is equal to;

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

If there is one statement included in the loop, the curly brackes can be omitted. But using them is always a better approach.

Read: Why is it considered a bad practice to omit curly braces?

Upvotes: 5

ISanych
ISanych

Reputation: 22690

You second case effectively means:

    for(int i = 1; i <= intInput; i++)
    {
        for(int j = 1; j<=i; j++)
        {
            Console.Write('+');
        }
        Console.WriteLine();                                    
    }

Indentation means nothing for compiler it is only for you

Upvotes: 4

David Pilkington
David Pilkington

Reputation: 13628

The loop has a scope. If you do not include the braces, only the first line is in the loop. If you have the braces, everything inside falls under the scope of the loop.

In this case, the first example write a "+" to the console as well as a new line every iteration of the inner loop.

The second case, the inner loop only executes the "+" writing on each inner iteration. The outer loop adds the new line.

Upvotes: 2

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