Question: The following problem illustrates the way memory aliasing can cause unexpected program behavior. Consider the following procedure to swap two values: 1 2 3 4

The following problem illustrates the way memory aliasing can cause unexpected program behavior. Consider the following procedure to swap two values:

1 2 3 4 5 67 /* Swap value x at xp with value y at yp */ void swap(long *xp, long *yp) { *xp = *xp + *yp; /*

1 2 3 4 5 67 /* Swap value x at xp with value y at yp */ void swap (long *xp, long *yp) { *xp = *xp + *yp; /* x+y *yp *xp *xp = *xp = - */ *yp: /* x+y-y = x */ *yp; /* x+y-x = y */ } If this procedure is called with xp equal to yp, what effect will it have?

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