Question

Possible Duplicate:
C comma operator

I came across a line of code which I couldn’t understand. I remember seeing something similar somewhere.

int x,y,z;
x=(y=2,z=2*y,z+4);

I know that the value assigned to x is 8. Can someone explain me why?

Answer 1

This is equivalent to:

 y = 2;      // y == 2
 z = 2 * y;  // z == 4
 x = z + 4;  // x == 8

The operands of the comma operator are evaluated from left to right and the result is the value of the right operand.