Introduction to computer programming, variables, comments, basic I/O operations, flow control (if) CPPE1 M1 Test

Introduction to computer programming, variables, comments, basic I/O operations, flow control (if) CPPE1 M1 Test

1. Which of the following string dose not represent a valid variable name?

   • Auto
   • auto
   • AUTO
   • aUTO

2. What is the output of the following snippet if a string 2.5 followed by Enter is enter through the keyboard?

   #include <iostream>
   
   using namespace std;
   
   void f(struct S S) {
      S.S[0] = S.S[1] + S.S[2] - 4;
   }
   
   int main()
   {
       float x;
       
       cin >> x;
       cout << scientific << "x";
   }

   • 0.25E1
   • x
   • 2.5
   • 2.5E0

3. What is the value of the following literal?

   0E1

   • The literal is invalid
   • 0
   • 0.1
   • 0.01

4. What is the value of the following literal?

   018

   • 16
   • 10
   • The literal is invalid
   • 2

5. What is the output of the following snippet if a digit 8 followed by Enter is enter through the keyboard?

   #include <iostream>
   
   using namespace std;
   
   int main()
   {
       int i;
       
       cin >> i;
       cout << i << hex << i + i << oct << i;
   }

   • 81010
   • 810010
   • 8168
   • 8x10010

6. What is the  final value of the k variable?

   int i = 3, j = 2, k = -1;
   
   if(i > 0) {
      if(j <= 0) {
         if(k < 0)    
            k++;
         if(k <= 0) 
            k--;
       }
       if(j > 0)
         i++;
   }
   
   if(i <= 0)
       j++;
   
   k = i + j + k;

   • 6
   • 4
   • 5
   • 3

7. What is the value of the x variable?

   float x = 1. / 2. + 2. / 4.;

   • 0.75
   • 0.5
   • 0.25
   • 1.0

8. What​ is the value of the following literal?

   -le-1

   • -0.1
   • -10.0
   • The literal is invalid.
   • -1.0

9. Which of the following string represents a legal variable name?

   • 1st_literal_is_invalid
   • first literal is invalid
   • first_literal_is_invalid
   • #1_literal_is_invalid

10. Which of the following string is a correct integer number(in the C++ language sense)?

    • 3'14
    • 3E14
    • 3.14
    • 3,14 

11. Which of the following string is a proper floating-point number(in the C++ language sense)?

    • E14
    • 3.14
    • 3,14
    • 3_14

12. What is the value of the following literal?

    x10

    • The literal is invalid
    • 2
    • 16
    • 10

13. What is the value of the k variable?

    int k = 1 % 2 + 4 % 2;

    • 2
    • 3
    • 0
    • 1

14. What is the final value of the k variable?

    int i = 3,  j, k;
    
    if(i > 0) j = 2 + i * i;
    if(i <= 0) j = 2 * i - 1;
    if(j >= 0) k = j % i + 2;
    if(j < 0) k = i % j + 2;
    if(k < 0) k= k % i % j;
    if(k >= 0)k = j % i % k;

    • 1
    • 0
    • 3
    • 2

15. What is the value of the k variable?

    int i = 1;
    int j = ++i;
    int k = j++;

    • 2
    • 3
    • 1
    • 0

16. What is the output of the following snippet?

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

    • 345
    • 545
    • 543
    • 454

17. What is the value of the following literal?

    010

    • 2
    • The literal is invalid
    • 8
    • 10

18. What is the value of the following literal?

    0x1A

    • 16
    • 6
    • 26
    • The literal is invalid

19. What is the value of the i variable?

    float x = 1.0 / 4.0
    int i = x;

    • 0.33
    • 1
    • 0
    • 0.25

20. What is the output of the following snippet if a digit 5 followed by Enter is entered throung the keyboard?

    #include <iostream>
    
    using namespace std;
    
    int main()
    {
       int i = 3, j = ++i, k = ++i;
    
       cin >> i;
       cout << k + i << j - i << i * i;
    }

    • 10545
    • 10-545
    • 10125
    • 10-125