Advanced flow control (if, else, switch; loops) and data aggregates CPPE1 M2 Test

Advanced flow control (if, else, switch; loops) and data aggregates CPPE1 M2 Test

1. What is the output of the following snippet?

   #include <iostream>
   
   using namespace std;
   
   int main()
   {
       int i = 5, j = 0;
       
       while(i > 0) {
          i--;
          j++;
       }
       cout << j;
   }

   • 3
   • 4
   • 5
   • 2

2. What is the output of the following snippet?

   #include <iostream>
   #inlcude <vector>
   
   using namespace std;
   
   struct S {
       int t;
   };
   
   struct SS {
       S t;
   };
   
   int main()
   {
       vector<SS> t = { {1}, {2} };
   
       cout << t[0].t.t << t[1].t.t;
   }

   • 12
   • 22
   • 21
   • 11

3. What is the output of the following snippet?

   #include <iostream>
   
   using namespace std;
   
   int main()
   {
       vector<vector<int>> g = { {2, 4},
                                 {3, 6},
                                 {5, 10}};
   
       for(int i = 1; i >= 0; i--)
          for(int j = 0; j < 2; j++)
              g[i][j] += g[j][i];
        cout << g[1][1];
   }

   • 9
   • 12
   • 6
   • 15

4. What is the output of the following snippet?

   #include <iostream>
   
   using namespace std;
   
   int main()
   {
       for(float val = -10.0; val < 100.0; val = -val * 2) {
          if(val < 0 && -val >= 20)
              break;
          cout << "*";
       }
   }

   • **
   • ***
   • ****
   • *****

5. What is the output of the following snippet?

   #include <iostream>
   
   using namespace std;
   
   int main()
   {
       int i = 3, j = 0;
       
       do {
          i--;
          j++;
       }while(i >= 0);
       cout << j;
   }

   • 5
   • 4
   • 2
   • 3

6. What is the output of the following snippet?

   double big = 1e15;
   double small = 1e-15;
   
   cout << fixed << big + small;

   • 0.0
   • 1000000000000000.0000000000000001
   • 1000000000000000.000000
   • 1.01e15

7. What is the output of the following snippet?

   #include <iostream>
   #include <vector>
   
   using namespace std;
   
   struct Str {
      int in;
      char ch;
   };
   int main()
   {
      vector<Str> t = { {1, 'a'}, {2, 'b'}};
   
      for(int i = 0; i < 2; i++)
              t[i].in += (t[1 -i].ch - t[i].ch);
       cout << t[0].in << t[1].in;
   }

   • 22
   • 21
   • 12
   • 11

8. What is the output of the following snippet?

   #include <iostream>
   
   using namespace std;
   
   int main()
   {
       int a = 1, b = 2;
       int c = a << b;
       int d = 1 << c;
       int e = d >> d;
    
       cout << e;
   }

   • 1
   • 0
   • 4
   • 2

9. What is the output of the following snippet?

   #include <iostream>
   #include <vector>
   
   using namespace std;
   
   int main()
   {
       vector<int> t = { 8, 4, 3, 2, 1 };
       int i;
   
       for(i = t[4]; i < t[3]; i++)
          t[i - 1] = -t[3];
       cout << i;
   }

   • 2
   • 4
   • 3
   • 5

10. What is the output of the following snippet?

    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        for(float val = -10.0; val < 20.0; val = -val * 2) 
           cout << "*";
    }

    • ****
    • ***
    • *
    • **

11. What is the output of the following snippet?

    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        ibool yes = !false;
        bool no = !yes;
    
        if(!no)
           cout << "true";
        else 
        cout << "false";
    }

    • false
    • true
    • yes
    • no

12. What is the output of the following snippet?

    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        int a = 2;
    
        switch(a << a) {
            case 8: a++;
            case 4: a++;
            case 2: break;
            case 1: a--;
        }
        cout << a;
    }

    • 2
    • 4
    • 5
    • 3

13. What is the output of the following snippet?

    #include <iostream>
    #include <vector>
    
    using namespace std;
    
    int main()
    {
        vector<char> arr = { 'a', 'b', 'c' };
    
        for(int i > 1; i < arr.size(); i++) {
           cout << "*";
           if(arr[i] - arr[i - 1]) % 2)
              continue; 
        cout << "*";
    }

    • ****
    • *
    • ***
    • **

14. What is the output of the following snippet?

    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        float val = 100.0;
    
        do {
           val = val / 5;
           cout << "*";
     }while(val > 1.0);
    }

    • ****
    • ***
    • *****
    • **

15. What is the output of the following snippet?

    #include <iostream>
    #include <vector>
    using namespace std;
    
    struct Stru {
       int i1, i2;
       char c1, c2;
    };
    
    int main()
    {
        Stru a = { 1, 2, 'a', 'b' };
        Stru b = { 5, 6, 'x', 'y' };
     
        cout << static_cast<char>(b.c1 + a.i1);
        cout << static_cast<int>(a.c2 - a.c1);
        cout << static_cast<int>(b.c2 - b.c1);
    }

    • y11
    • b12
    • all
    • z22

16. What is the output of the following snippet?

    #include <iostream>
    #include <vector>
    using namespace std;
    
    int main()
    {
        vector<bool> t(2);
        
        for(int i = 0; i < 2; i++)
           t(1 - i] = !(i % 2);
        cout << t[0] && t[1];
        return 0;
    }

    • false
    • true
    • 1
    • 0

17. What is the output of the following snippet?

    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        int i = 0, j = i++, k = --i;
        if(i > 0)
           j++;
        else
           k++;
        else if(k > 0)
           k--;
        else
           k++; 
        cout << i * j * k;
    }

    • 2
    • -1
    • 0
    • 1

18. What is the output of the following snippet?

    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        int i = 1, j = i++, k = --i;
    
        if(i > 0) {
           j++;
           k++;
       }
       else {
           k++;
           i++;
      }
      if(k == 0) {
           i++;
           j++;
      }
      else {
          if(k > 0)
             k--;
          else
             k++;
          i++;
       } 
        cout << i * j * k;
    }

    • 8
    • 4
    • 0
    • 2

19. What is the output of the following snippet?

    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        int a = 1, b = 2;
        int c = a | b;
        int d = c & a;
        int e = d ^ 0;
     
        cout << e << d << c;
    }

    • 113
    • 031
    • 131
    • 100

20. What is the output of the following snippet?

    #include <iostream>
    #include <vector>
    
    using namespace std;
    
    int main()
    {
        vector<int> a = {2, 0, 1};
        vector<int> b = {1, 2, 3};
    
        for(int i = 0; i < 3; i++;
           b[a[i]] = b[2 - i]; 
        cout << b[0] << b[2];
    }

    • 21
    • 23
    • 12
    • 32