
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:**1. Given the program below,**
```cpp
#include <iostream>
using namespace std;
int fun(int *k) {
*k += 4;
return 3 * (*k) - 1;
}
int main() {
int i = 10, j = 10, sum1, sum2;
sum1 = (i/2) + fun(&i);
sum2 = fun(&j) + (j/2);
cout << sum1 << endl;
cout << sum2 << endl;
return 0;
}
```
**a) Predict the values of sum1 and sum2 if the operands in the expressions for sum1 and sum2 are evaluated left to right.**
**b) Predict the values of sum1 and sum2 if the operands in the same expressions are evaluated right to left.**
**c) Predict the values of sum1 and sum2 if functions are evaluated first.**
**d) Compile with g++ and run the program on pluto or your favorite C++ environment, what are the values for sum1 and sum2?**
**2. Given the program below,**
```cpp
#include <iostream>
using namespace std;
int a = 5;
int fun1() {
a = 17;
return 3;
}
int fun(int* i) {
*i += 5;
return 4;
}
int main() {
a = a + fun1();
cout << "a = " << a << endl;
int x = 3;
x = x + fun(&x);
cout << "x = " << x << endl;
return 0;
}
```
**a) What would be the output if you compile with g++ and run the program on pluto?**
**b) Based on 3 and 4 a), what conclusion can you make on operands evaluation order in C++, left-to-right or right-to-left?**
---
### Explanation:
#### Program 1:
1. **`fun(int *k)` Function:**
- Adds 4 to the value pointed to by `k`.
- Returns `3 * (*k) - 1`.
2. **`main` Function:**
- Initializes `i` and `j` to 10.
- Calculates `sum1` and `sum2` with expressions using `fun`.
####
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