What do you mean by inline function?
The idea behind inline functions is to insert the code of a called
function at the point where the function is called. If done carefully,
this can improve the application's performance in exchange for increased
compile time and possibly (but not always) an increase in the size of
the generated binary executables.
Write a program that ask for user input from 5 to 9 then calculate
the average
#include "iostream.h"
int main() {
int MAX = 4;
int total = 0;
int average;
int numb;
for (int i=0; i<MAX; i++) {
cout << "Please enter your input between 5 and 9: ";
cin >> numb;
while ( numb<5 || numb>9) {
cout << "Invalid input, please re-enter: ";
cin >> numb;
}
total = total + numb;
}
average = total/MAX;
cout << "The average number is: " << average << "\n";
return 0;
}
Write a short code using C++ to print out all odd number from 1 to
100 using a for loop
for( unsigned int i = 1; i < = 100; i++ )
if( i & 0x00000001 )
cout << i << \",\";
What is public, protected, private?
Public, protected and private are three access specifier in C++.
Public data members and member functions are accessible outside the
class.
Protected data members and member functions are only available to
derived classes.
Private data members and member functions can’t be accessed outside the
class. However there is an exception can be using friend classes.
Write a function that swaps the values of two integers, using int* as
the argument type.
void swap(int* a, int*b) {
int t;
t = *a;
*a = *b;
*b = t;
}
Tell how to check whether a linked list is circular.
Create two pointers, each set to the start of the list. Update each as
follows:
while (pointer1) {
pointer1 = pointer1->next;
pointer2 = pointer2->next; if (pointer2) pointer2=pointer2->next;
if (pointer1 == pointer2) {
print (\"circular\n\");
}
}
OK, why does this work?
If a list is circular, at some point pointer2 will wrap around and be
either at the item just before pointer1, or the item before that. Either
way, it’s either 1 or 2 jumps until they meet.
What is virtual constructors/destructors?
Answer1
Virtual destructors:
If an object (with a non-virtual destructor) is destroyed explicitly by
applying the delete operator to a base-class pointer to the object, the
base-class destructor function (matching the pointer type) is called on
the object.
There is a simple solution to this problem declare a virtual base-class
destructor.
This makes all derived-class destructors virtual even though they don’t
have the same name as the base-class destructor. Now, if the object in
the hierarchy is destroyed explicitly by applying the delete operator to
a base-class pointer to a derived-class object, the destructor for the
appropriate class is called. Virtual constructor: Constructors cannot be
virtual. Declaring a constructor as a virtual function is a syntax
error.
Answer2
Virtual destructors: If an object (with a non-virtual destructor) is
destroyed explicitly by applying the delete operator to a base-class
pointer to the object, the base-class destructor function (matching the
pointer type) is called on the object.
There is a simple solution to this problem – declare a virtual
base-class destructor. This makes all derived-class destructors virtual
even though they don’t have the same name as the base-class destructor.
Now, if the object in the hierarchy is destroyed explicitly by applying
the delete operator to a base-class pointer to a derived-class object,
the destructor for the appropriate class is called.
Virtual constructor: Constructors cannot be virtual. Declaring a
constructor as a virtual function is a syntax error. Does c++ support
multilevel and multiple inheritance?
Yes.
What are the advantages of inheritance?
• It permits code reusability.
• Reusability saves time in program development.
• It encourages the reuse of proven and debugged high-quality software,
thus reducing problem after a system becomes functional.
What is the difference between declaration and definition?
The declaration tells the compiler that at some later point we plan to
present the definition of this declaration.
E.g.: void stars () //function declaration
The definition contains the actual implementation.
E.g.: void stars () // declarator
{
for(int j=10; j>=0; j--) //function body
cout<<”*”;
cout<<endl; }
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