c_cpp 代码块的变量范围

Posted 2021-05-14

	do
	{
		int x = get_int("Please input an integer that is between 1 and 23: ");
	}
	while ((x<1) || (x>23)); // Declare "x" inside the while loop, the scope of "int x" only exist within the while loop brackets. Can't use it outside of the while loop brackets.

  // The correct way of declare "int x" if want to use it later after the while loop:
  
	int x;

	do
	{
		x = get_int("Please input an integer that is between 1 and 23: ");
	}
	while ((x<1) || (x>23));