/* block structure (variable scope) */

#include<stdio.h>

int main()
{
	int x = 10;
	printf("x=%d\n", x);
	{
		int x = 5;
		printf("x=%d\n", x);
		x = x + 15;
		printf("x=%d\n", x);
		{
			int x = 40;
			printf("x=%d\n", x);
			x = x + 4;
			printf("x=%d\n", x);
		}
	}
	x = x + 15;
	printf("x=%d\n", x);

	return 0;
}