This function is used to change the size of memory object pointed by address ptr to the size given by size. If ptr is a null pointer, then realloc will behave like malloc(). If the ptr is an invalid pointer, then defined behaviour may occur depending the implementation. Undefined behaviour may occur if the ptr has previously been deallocated by free(), or dealloc() or ptr do not match a pointer returned by an malloc(), calloc() or realloc().
What does a reference provide? a) Alternate name for the class b) Alternate name for the variable c) Alternate name for the pointer d) none of the mentioned
Identify the correct sentence regarding inequality between reference and pointer. a) we can not create the array of reference. b) we can create the Array of reference. c) we can use reference to reference. d) none of the mentioned
Which value we cannot assign to reference? a) integer b) floating c) unsigned d) null
What is output of this program?
#include <iostream>
using namespace std;
int main()
{
int a = 9;
int & aref = a;
a++;
cout << "The value of a is " << aref;
return 0;
}
a) 9
b) 10
c) error
d) 11What is the output of this program?
#include <iostream>
using namespace std;
void swap(int &a, int &b);
int main()
{
int a = 5, b = 10;
swap(a, b);
cout << "In main " << a << b;
return 0;
}
void swap(int &a, int &b)
{
int temp;
temp = a;
a = b;
b = temp;
cout << "In swap " << a << b;
}
a) In swap 105 In main 105
b) In swap 105 In main 510
c) In swap 510 In main 105
d) none of the mentionedIdentify the incorrect statement a) reference is the alternate name of the object b) A reference value once defined can be reassigned c) A reference value once defined cannot be reassigned d) none of the mentioned
What is output of program?
#include <iostream>
using namespace std;
void print (char * a)
{
cout << a << endl;
}
int main ()
{
const char * a = "Hello world";
print(const_cast<char *> (a) );
return 0;
}
a) Hello world
b) Hello
c) world
d) compile time errorCan you please explain what is class using C++?
What is static type varidentifier?
Explain the uses of static class data?
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