Example (xy)

• def is an assignment to a variable

• c-use is a computational use of a variable

• p-use is a predicate use of a variable

1. scanf(x,y); if (y < 0)

2. pow = -y;

3. else pow = y;

4. z = 1.0;

5. while (pow != 0)

6. {z=z*x;pow--;}

7. if (y < 0)

8. z = 1.0/z;

9. printf(z);

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