control structure outputting wrong iterations via ints.

[ajetrumpet]

all,

I have this:

			for (chr_min = 0; chr_min <= 24; chr_min += 3)
			{
				strOut = "";
				for (ctr_row = 1; ctr_row <=3; ctr_row++)
				{
					switch (ctr_row)
					{
					case 1:
						strOut = strOut + Line1.substr(chr_min, 3);
						cout << ctr_row << endl;
					case 2:
						strOut = strOut + Line2.substr(chr_min, 3);
						cout << ctr_row << endl;
					case 3:
						strOut = strOut + Line3.substr(chr_min, 3);
						cout << ctr_row << endl;
					}
				}
					cout << strOut << endl;
			}

it is outputting to the shell window, this:

1
1
1
2
2
3

and that pattern apparently repeats for every iteration that's specified in the outer loop. am I missing something here?

I sure hope this is not because my CPP understanding is not up to par! thanks. any help surely appreciated.