/* block structure (variable scope) */

#include<stdio.h>

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

	return 0;
}