1. **Stating the problem:** We have variables A, B, C and pointers P1 and P2 assigned as follows, with instructions performed sequentially. We need to find the values of A, B, C, P1, and P2 after each instruction. 2. **Understanding initial conditions:** - P1 = &A means P1 points to A. - P2 = &C means P2 points to C. 3. **Instruction 1: P1 = (*P2)++** - *P2 is the value of C, so the value at P2. - (*P2)++ means the value at P2 is used then incremented. - Since P1 is assigned to the value of (*P2) before increment, P1 now points to the old value of C (or equivalently, P1 is set to some value equal to the original C). - After increment, C increases by 1. 4. **Instruction 2: P1 = P2** - P1 now points to where P2 points, which is &C. 5. **Instruction 3: P2 = &B** - P2 now points to B. 6. **Instruction 4: *P1 = *P2** - The value at P1 (which points to C) is set to the value at P2 (which points to B). - So C = B. 7. **Instruction 5: ++*P2** - Increment the value at P2 (which points to B) by 1. 8. **Instruction 6: *P1 = *P2** - Value at P1 (C) set to value at P2 (B). 9. **Instruction 7: A = ++*P2 * *P1** - Increment *P2 first (B is incremented). - Multiply by *P1 (C), assign to A. 10. **Instruction 8: P1 = &A** - P1 now points to A. 11. **Instruction 9: *P2 = *P1 = *P2** - Both *P1 and *P2 assigned the value of *P2. - Since P1 points to A and P2 to B, this sets A and B to the current value of B. **Note:** Without initial values for A, B, C, exact numerical values after each step cannot be given. Conceptually, the operations involve pointer assignments and increments affecting A, B, C. Final concise summary: - After instruction 1: C increments by 1, P1 points to old value of C. - After instruction 2: P1 points to C. - After instruction 3: P2 points to B. - After instruction 4: C = B. - After instruction 5: B incremented by 1. - After instruction 6: C = B. - After instruction 7: A = (B+1) * C. - After instruction 8: P1 points to A. - After instruction 9: A and B set to B. This completes the tracing.