Test Series - cpp

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Test Number 88/102

Q: What is the use of checked iterators?
A. Overwrite the bounds of your container
B. Not allow you to overwrite the bounds of your container
C. It will check the list value
D. Overwrite the bounds of your iterators
Solution: Checked iterators ensure that you do not overwrite the bounds of your container.
Q: What will happen if the iterator is unchecked?
A. Arising of compiler warnings
B. Unchecked behavior on program
C. Nothing will execute
D. Arising of compiler warnings & Unchecked behavior on program
Solution: We will get unchecked behavior on calls to an unchecked function and Calls to the standard function will result in compiler warnings.
Q: How many adaptors support the checked iterators?
A. 1
B. 2
C. 3
D. 4
Solution: There are two adaptors that support checked iterators. They are checked_array_iterator class, Checked_iterator class.
Q: What does the checked iterator allow you to find?
A. Warnings
B. Compile time error
C. Run time error
D. Warnings & Run time error
Solution: Checked iterator allow you to find Run time error.
Q: What kind of errors do checked iterators detect?
A. Uninitialized iterators
B. Initialized iterators
C. Range access
D. Both Uninitialized iterators and range access
Solution: Checked iterators can easily detect the errors in Uninitialized iterators as well as Range of access.
Q: Where are allocators used?
A. Allocation of memory
B. Deallocation of memory
C. Used for pointers
D. Both Allocation & Deallocation of memory
Solution: Allocators handle all the request for allocation and deallocation of memory for the container.
Q: Where are allocators implemented?
A. Template library
B. Standard library
C. C++ code library
D. String library
Solution: Allocators are implemented in C++ standard library but it is used for C++ template library.
Q: Which operator is used to allocate the memory?
A. =
B. +
C. new
D. free
Solution: The default allocator uses operator new to allocate memory.
Q: What is the use of reference member type in allocator?
A. Point to an element
B. Quantities of element
C. Reference to an element
D. Sequence of an element
Solution: free() function is used to free the memory used by the program.
eg,
int *p = (int*) malloc(sizeof(int)); //allocation of memory.
free(p); // freeing the memory occupied by pointer p.
Q: What is the correct syntax for declaring an allocator?
A. template < class T > class allocator;
B. template < class T > class;
C. template class allocator;
D. template class()
Solution: It is a type of syntax for declaring the allocater.

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