Chapter 6 Exercise Set 1: CPE Practice

1. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int main() {
       int i = 12;
       float f = 1000.0;
       while (i > 0) {
           i -= 3;
           f /= 10;
       }
       cout << f << endl;
       return 0;
   }
   

2. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int main() {
       int i = 12;
       float f = -1.0;
       while (i < 0) {
           f = f + 5.0 * f / -5; 
           --i;
       }
       cout << i << endl;
       return 0;
   }
   

3. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int main() {
       int n = 1, m = n & 0;
       do {
           m++;
           if (m > 1)
               n = m;
       } while (n < 3);
       cout << m << endl;
       return 0;
   }
   

4. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int doit(int n, int t = 2) {
       int x = n;
       while (t >>= 1)
           x++;
       return x;
   }
   
   int main() {
       cout << doit(2, 4) << doit(6) << endl;
       return 0;
   }
   

5. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int main() {
       int a, b = 2 | 5;
       for (a = 0; a < 3; a += 2)
           b++;
       cout << b << endl;
       return 0;
   }
   

6. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int main() {
       int n = 0, m = 7 ^ 5;
       while (n == 0) {
           if (m > 1)
               n = m;
           ++m;
       }
       cout << n << m << endl;
       return 0;
   }
   

7. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int main() {
       for (float val = -10.0; val < 100.0; val = -val * 2) {
           if (val < 0 && -val >= 40)
               break;
           cout << '*'; 
       }
       cout << endl;
   
       return 0;
   }
   

8. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int main() {
       float v = 500.0;
       do {
           v /= 5;
           cout << '*';
       } while (v > 1.0);
       cout << endl;
   
       return 0;
   }
   

9. What is the output of the following program?

   #include <iostream>
   using namespace std;
   
   int main() {
       int u = 2, v = 1;
       do {
           u--;
           v++;
       } while (u >= 0);
       cout << u << '&' << v << endl;
   
       return 0;
   }
   

10. What is the output of the following program?

    #include <iostream>
    using namespace std;
    
    int main() {
        char ch = 'd';
        for (float f = -4.0; f < 100; f *= -2)
            cout << ++ch;
        cout << endl;
    
        return 0;
    }
    

11. What is the output of the following program?

    #include <iostream>
    using namespace std;
    
    int main() {
        int a = 3, b = 1;
    
        while (a > 0) {
            a--;
            b++;
        }
    
        cout << a << ' ' << b << endl; 
    
        return 0;
    }
    

12. What is the output of the following program?

    #include <iostream>
    using namespace std;
    
    char f(char n) {
        int count = 0;
        for (n = 4 * n; n > 0; n >>= 2)
            count++;
        return count;
    }
    
    void f(int n) {
        for (char count = f(char(n)); count > 0; count--)
            cout << '*';
    }
    
    int main() {
        char x = 3;
        f(3);
        cout << endl;
        return 0;
    }