Accessing data: arrays of pointers, conversions, strings, namespaces, and exceptions CPPE1 M4 Test

Accessing data: arrays of pointers, conversions, strings, namespaces, and exceptions CPPE1 M4 Test

  1. What is the output of the following snippet?

    #include <iostream>

using namespace std;

int main()
{
    short s = 1;
    int i = 2;
    float f = 4.4;
    double d = 6.6;
  
    cout << i/static_cast<float>(s) + int(f)/i + (long)d/s;
    return 0;
}
    • 8.8
    • Compilation fails
    • 10
    • 8.0

  2. What is the output of the following snippet?

    #include <iostream>
#include <string>

using namespace std;

int main()
{
    int i = 2;
    string s = "2";
   
    cout << s + i;
}
    • 2
    • 4
    • 2
    • Compilation fails

  3. What is the output of the following snippet?

    #include <iostream>
#inlcude <string>

using namespace std;

int main()
{
    string s1 = "aleph";
    string s2 = "alpha";
    string s;

    s1.swap(s2);
    s2.swqp(s);
    s.swap(s2);
    cout << s2;
}
    • Compilation fails
    • alpha
    • aleph
    • It prints an empty string

  4. What is the output of the following snippet?

    #include <iostream>

using namespace std;

int main()
{
    int i = 2;
    float f = 4.4;
  
    cout << f % static_cast<float>(i);
}
    • 0
    • 2
    • Compilation fails
    • 0.2

  5. What is the output of the following snippet?

    #include <iostream>
#include <string>

using namespace std;

int main()
{
    string s = "ABC";
    for(int i = 1; i < s.length(); i += 2)
        s[i - 1] = s[i] + 'a' - 'A';
  
    cout << s;
}
    • bBC
    • Compilation fails
    • bBc
    • aAcC

  6. What is the output of the following snippet?

    #include <iostream>
#include <string>

using namespace std;

int main()
{
    string s = "a";
  
    cout << s + "b" + "c";
}
    • abc
    • Compilation fails
    • ab
    • a

  7. What is the output of the following snippet?

    #include <iostream>

using namespace std;

int main()
{
    int *it[3];
  
    for(int i = 0; i < 3; i++) {
       it[i] = new int [i + 1];
       for(int j = 0; j < i + 1; j++)
          it[i][j] = 10 * i + j;
    }
  
    cout << it[2][2];
    for(int i = 0; i < 3; i++)
       delete [] it[i];
}
    • 33
    • 11
    • Compilation fails
    • 22

  8. What is the output of the following snippet?

    #include <iostream>

namespace SpaceA {
    int A;
}

namespace SpaceB {
    int A;
}

using namespace SpaceA, SpaceB;

int main()
{
    SpaceA::A = SpaceB::A = 1;
    std:cout << A + 1;
}
    • Compilation fails
    • 0
    • 1
    • 2

  9. What is the output of the following snippet?

    #include <iostream>

using namespace std;

int main()
{
    int i = 2;
    float f = 5.8;
  
    f = static_cast<int>(f);
    i = static_cast<float>(i);
    cout << f/i;
}
    • 2.5
    • Compilation fails
    • 1
    • 3

  10. What is the output of the following snippet?

    #include <iostream>
#include <string>

using namespace std;

int main()
{
    string s = "AB";
    s.append(s).push_back(s[s.length() - 1]);
    cout << s;
}
    • ABAB
    • ABABA
    • ABABB
    • Compilation fails

  11. What is the output of the following snippet?

    #include <iostream>
#include <string>

using namespace std;

int main()
{
    string s1 = "ab";
    string s2 = "ABC";

    if(s1 >s2)
       cout << "yes";
    else
       cout << "NO";
}
    • yes
    • NO
    • Compilation fails
    • It prints nothing

  12. What is the output of the following snippet?

    #include <iostream>

using namespace std;

int main()
{
    string s1 = "1";
    string s2 = "2";

    cout << s1.compare(s2);
}
    • 1
    • Compilation fails
    • 0
    • -1

  13. What is the output of the following snippet?

    #include <iostream>
#include <string>

using namespace std;

int main()
{
    string s ="a";

    cout << s << "b" + "c";
}
    • ab
    • abc
    • Compilation fails
    • a

  14. What is the output of the following snippet?

    #include <iostream>
#include <string>

using namespace std;

int main()
{
    string s = "0123";
    cout << s.substr(1,3).substr(2).substr();
}
    • 3
    • 123
    • It prints an empty string
    • Compilation fails

  15. What is the output of the following snippet?

    #include <iostream>

using namespace std;

int main()
{
    string s1 = "Ab";
    string s2 = "Abc";

    cout << s1.compare(s1);
}
    • Compilation fails
    • 0
    • 1
    • -1

  16. What is the output of the following snippet?

    #include <iostream>
#include <vector>

using namespace std;

int main()
{
    vector<float *> ft = { new float[3], new float[3], new float[3] };
    float *p = nullptr;

    for(int i = 0; i < 3; i++) {
       p = ft[i];
       *p = p[1] = *(p + 2) = 10 * i;
    }
    cout << ft[1][1];
    delete [] ft[0];
    delete [] ft[1];
    delete [] ft[2];
}
    • Compilation fails
    • 20
    • 30
    • 10

  17. What is the output of the following snippet?

    #include <iostream>
#include <string>
#include <vector>

using namespace std;

int main()
{
    vector<string> t = { "alpha", "beta", "gamma" };
    int *cnt = new int[3], *p = &cnt[0];

    for(int i = 0; i < t.size(); i++)
       *p++ = t[i].length();
    cout << cnt[0] << cnt[1] << cnt[2];
    delete [] cnt;
}
    • 012
    • 111
    • 545
    • Compilation fails

  18. What is the output of the following snippet?

    #include <iostream>

using namespace std;
namespace S1{
   int A = 1;
}
namespace S2{
   int A = 2;
}
int main()
{
    { using namespace S1;
        S2::A = A + 1;
    }
    { using namespace S2;
        S1::A = A + 1;
    }
    cout << S1::A << S2::A;   
}
    • 32
    • 33
    • 23
    • Compilation fails

  19. What is the output of the following snippet?

    #include <iostream>

using namespace std;

int main()
{
    short s = 1;
    int i = 2;
    float f = 4.4;
    double d = 8.8;
  
    cout << s/i + f/i + d/s;
    return 0;
}
    • 11
    • Compilation fails
    • 6.6
    • 4.4

  20. What is the output of the following snippet?

    #include <iostream>

using namespace std;

namespace S {
   int A = 1;
}

namespace S {
    int B = A + 2;
}

int main()
{
    S::A = S::A + 1;
    {
        using namespace S;
        ++B;
    }
    cout << S::B << S::A;
    return 0;
}
    • Compilation fails
    • 32
    • 42
    • 22
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