#include iostreamhvoid subint x int y int z z = y + x;void main int a b c;sub8 4 &a;sub6 a &b;suba b &c;cout a b c endl;

The output of this program is:

12,18,-6

Explanation:

• The function sub() takes in three parameters: x, y, and a pointer to an integer variable z.
• It adds x and y together, and stores the result in the memory location pointed to by z.
• In the main() function, we declare three integer variables: a, b, and c.
• We call sub() three times, passing in different values for x, y, and z each time.
• The first call to sub() sets a to 12 (since 8 + 4 = 12).
• The second call to sub() sets b to 18 (since 6 + a = 6 + 12 = 18).
• The third call to sub() sets c to -6 (since a - b = 12 - 18 = -6).
• Finally, we print out the values of a, b, and c using cout