Interview question based on skill :
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Total Questions: 20
1. If the object is passed by value to a copy constructor:
Correct Answer is : Compiler will give out of memory error
2. Which object will be created first? class student { int marks; }; student s1, s2, s3;
Correct Answer is : s1 then s2 then s3
3. Which among the following helps to create a temporary instance?
Correct Answer is : Explicit call to a constructor
4. Which among the following is correct for the class defined below? class student { int marks; public: student(){} student(int x) { marks=x; } }; main() { student s1(100); student s2(); student s3=100; return 0;
Correct Answer is : Program runs and all objects are created
5. For constructor overloading, each constructor must differ in ___________ and __________
Correct Answer is : Number of arguments and type of arguments
6. Which among the following is true for constructors overloading?
Correct Answer is : Constructors can be overloaded using different signatures
7. If a constructors should be capable of creating objects without argument and with arguments, which is a good alternative for this purpose?
Correct Answer is : Use constructor with all default arguments
8. The Constructors with all the default arguments are similar as default constructors. (True/False)
Correct Answer is : TRUE
9. Which among the following is true?
Correct Answer is : The constructors must have same name as that of class
10. Which among the following can be used in place of default constructor?
Correct Answer is : constructorName(int x=0,int y=0)
11. Can a class have more than one function with all the default arguments?
Correct Answer is : No, never
12. Which is the correct syntax for using default arguments with the constructor?
Correct Answer is : constructorName(int x=0)
13. How many parameters must be passed if only the following prototype is given to a constructor? Prototype: className(int x, int y, int z=0);
Correct Answer is : 2
14. If the constructors are overloaded by using the default arguments, which problem may arise?
Correct Answer is : The constructors might have all the same arguments except the default arguments
15. Which among the following is true?
Correct Answer is : More than one constructors with all default arguments can’t exist in same class
16. Which constructor among the following will be called if a call is made like className(5,’a’);?
Correct Answer is : className(int x=5,char c=’a’);
17. Which constructor definition will produce a compile time error?
Correct Answer is : className(int x=0,char c);
18. If there is a constructor with all the default arguments and arguments are not passed then _________________
Correct Answer is : Then all the default values given will be used
19. Which is the correct statement for default constructors?
Correct Answer is : The constructors with zero arguments
20. Which is a good alternative instead of having one zero argument constructor and one single argument constructor with default argument?
Correct Answer is : One default value constructor
