Chapter 10 Exercise Set 1: CPE Practice

1. What is the output of the following program?

   #include <iostream>
   #include <vector>
   using namespace std;
   
   int main() {
       vector<char> text(5);
       char *chp1 = text.data() + 2, *chp2 = chp1 + 3;
       cout << chp2 - text.data() << endl;
       return 0;
   }
   

2. What is the output of the following program?

   #include <iostream>
   #include <vector>
   using namespace std;
   
   int main() {
       vector<double> a = {1e-1, 1e0, 1e1};
       double *dp = a.data() + 2;
       cout << a[1] - *dp << endl;
       return 0;
   }
   

3. What is the output of the following program?

   #include <iostream>
   #include <vector>
   using namespace std;
   
   int main() {
       vector<float *> fpv = {new float[1], new float[1], new float[1]};    
       for (int i = 0; i < 3; i++) {
           float *fp = fpv[i];
           *fp = 2 * i + 1;
       }
       for (int i = 0; i < 3; i++) {
           cout << *fpv[i];
           delete[] fpv[i];
       }
       cout << endl;
       return 0;
   }
   

4. What is the output of the following program?

   #include <iostream>
   #include <vector>
   using namespace std;
   
   void swap(int* ip1, int* ip2) {
       int n = *ip1;
       int m = *ip2;
   } 
   
   int main() {
       vector<int> a = {3, 2, 1};
       swap(&a[0], &a[1]);
       swap(&a[2], &a[0]);
       cout << a[0] << ' ' << a[1] <<  ' ' << a[2] << endl;
       return 0;
   }
   

5. What is the output of the following program?

   #include <iostream>
   #include <vector>
   using namespace std;
   
   void swap(int* ip1, int* ip2) {
       int n = *ip1;
       *ip1 = *ip2;
       *ip2 = n;
   } 
   
   int main() {
       vector<int> a = {3, 2, 1};
       swap(&a[0], &a[1]);
       swap(&a[2], &a[0]);
       cout << a[0] << ' ' << a[1] <<  ' ' << a[2] << endl;
       return 0;
   }