unary minus:

	x = -y;  z = exp(-w*t);

integer vs. floating-point division:

	1/3  --->>>  0

	1.0/3.0 --->>> 0.3333333

	int m = 1, n = 3;

	double r = m/n;  --->>> 0

	r = (double)m/n;  --->>> 0.3333333	// (double) is a cast

	r = (int)(r + 1.0);  --->>> 1		// (int) is a cast

4 ways to add 1:

	a = a + 1;    a += 1;     ++a;      a++;

4 ways to subtract 1:

	a = a - 1;    a -= 1;     --a;      a--;

2 ways to add 5:

	a = a + 5;    a += 5;

2 ways to divide by 5:

	a = a/5;      a /= 5;

operators: * / %  + -  combined with assignment:  *= /= %= += -=

associativity:

      a = b + c + d;   same as:  a = (b + c) + d;

      a = b = c = d = 0;  same as: a = (b = (c = (d = 0)));

valid but weird assignment:

      z = y = 6 + (x = 5 + 7); // now x is 12, y and z are both 18