Miscellany

#include <stdio.h>

void main()
{
	int a = 2, b, c;

	b = a--;
	c = ++b;
	printf("%d \n", b++ * 3); \\ result is 9
	printf("%d \n", -cc *a++); \\ result 2
	printf("%d \n", ++a + -c * --b); \\ result -3 ---- i dont understand how its -3 and how's b = 4
}

Im learning from a book, 
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