How do I print # in a nested for loop [duplicate]

This question already has an answer here:

for (int i = 0; i <= 6; i++)
{
string doors = new string[6];
doors[i] = "#";
for (int j = 1; j <=i; j++)
{
Console.Write(doors[j]);
}
Console.Writeline():
}


Hi guys. I need to print # one and then # twice, until i get to six times. It says System.index.out.of.range. How come?

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string doors

#

Console.Write('#')

#

Console.Write('#');

4 Answers
4

If

I need to print # one and then # twice, until i get to six times.

You don't want any array - string doors = new string[6];, just loops:

string doors = new string[6];

for (int line = 1; line <= 6; ++line) {
for (int column = 1; column <= line; ++column) {
Console.Write('#');
}

Console.WriteLine();
}


If you have to work with array (i.e. array will be used somewhere else), get rid of magic numbers:

// Create and fill the array
string doors = new string[6];

for (int i = 0; i < doors.Length; i++)
doors[i] = "#";

// Printing out the array in the desired view
for (int i = 0; i < doors.Length; i++) {
for (int j = 0; j < i; j++) {
Console.Write(doors[j]);
}

Console.Writeline();
}


Please, notice that arrays are zero-based (array with 6 items has 0..5 indexes for them)

6

0..5

You should try to extend your array, it's limited to 6 elements but you try to access 7 elements as you go through 0 to 6.

for (int i = 0; i <= 6; i++)
{
string doors = new string[7];
doors[i] = "#";
for (int j = 1; j <=i; j++)
{
Console.Write(doors[j]);
}
Console.Writeline():
}


because it is out of range.

change it to this:

for (int i = 0; i <= 6; i++)
{
string doors = new string[6];
doors[i] = "#";
for (int j = 0; j <=i.length; j++)
{
Console.Write(doors[j]);
}
Console.Writeline():
}


i.length

int

No need to use 2 loops. Just repeat that character

for (int i = 0; i <= 6; i++)
{
Console.Write(new String("#",i));
Console.WriteLine():
}