Range-based for loop debug

[xueyangwu]

I was expecting the code below to print out 1,2,3,5,6 and [3], however, [3] did not show up. The second for loop might be problematic but I can't figure out. Can someone help? Thanks.

  #include <iostream>
#include <string>

using namespace std;

int main()
{
	string str = "1";


	for (int n = 2; n < 10; ++n)
	{
		
		if (n == 4) continue;

		if (n == 7)
		{
			cout << str << endl;
			break;
		}

		string lab = to_string(n);
		str = str + "," + lab;
	}

	char compare = (char) 3;

	for (char m : str)
	{
		if (m == compare)
		{
			cout << "[" << m << "]";
		}
	}

	cin.get();
}.

[keskiverto]

Ascii table says that value 3 corresponds to character ETX, which is unprintable "end of text".

Character '3' has numeric value 51.