C++ Question on References and Function Overloading

Prepared by
Mohammed Sikander
Technical Lead
CranesVarsity

 This presentation consists of set of questions
which on solving and reasoning will help you
to understand the concepts clearly.
 Topics include
 Pointers
 References
 FunctionOverloading
 Default arguments
Mohammed Sikander 2

void update(int *ptr)
{
*ptr++;
}
int main( )
{
int a = 5;
update(&a);
cout << a << endl;
}
Mohammed Sikander 3

void myswap(int *pa , int *pb)
{
int *temp = pa;
pa = pb;
pb = temp;
printf("MySwap *pa = %d *pb = %d n",*pa , *pb);
}
int main( )
{
int a = 5 , b = 10;
myswap(&a , &b);
printf("Main a = %d b = %d n",a , b);
}
Mohammed Sikander 4

Mohammed Sikander 5
Write the Output
void fun(int *ptr)
{
int b = 10;
ptr = &b;
printf(“Fun %d n”,*ptr);
}
int main()
{
int a = 5;
int *ptr = &a;
fun(ptr);
printf(“Main %d n“ , *ptr);
}

Mohammed Sikander 6
Write the Output
void fun(int ref)
{
ref++;
cout<<"Fun ref= "<<ref<<endl;
}
int main()
{
int a = 5;
int &ref = a;
fun(ref);
cout<<"Main ref= "<<ref<<endl;
}

int main()
{
int a = 4;
const int b = 3;
1. int *ptr1 = &a;
2. int *ptr2 = &b;
3. int * const ptr3 = &b;
4. const int * ptr4 = &b;
5. int * const ptr5 = &a;
6. const int * ptr6 = &a;
return 0;
}
Mohammed Sikander 7

int main()
{
int a = 4;
const int b = 3;
1. int &ref1 = a;
2. int &ref2 = b;
3. const int &ref3 = a;
4. const int &ref4 = b;
return 0;
}
Mohammed Sikander 8

int main( )
{
int a = 5 , b = 10 ;
int c = a + b;
int *ptr1 = &a + b;
int *ptr2 = &(a + b);
}
Mohammed Sikander 9
int main( )
{
int a = 5 , b = 10 ;
int &r1 = a + b;
int &r2 = 5;
}

Identify the valid and invalid statements.
void func(int &a)
{
}
int main( )
{
int a = 5, b = 10;
int c;
1. func(a);
2. func(c);
3. func(a + b);
4. func(5);
}
Mohammed Sikander 10

Identify the valid and invalid statements.
void func(const int &a)
{
}
int main( )
{
int a = 5, b = 10;
int c;
func(a); //statement 1
func(c); //statement 2
func(a + b); //statement 3
func(5); //statement 4
}

Can we overload these two functions
void func(int *p)
{
}
void func(int p)
{
}
int main()
{
}

void func(int &a)
{
}
void func(int a)
{
}
int main()
{
}

void func(int &a)
{
}
void func(const int &a)
{
}
int main()
{
}

char func( )
{
return 'a';
}
double func()
{
return 10.5;
}
int main()
{
char c = func();
double d = func();
}

What is the output
void func(char a)
{
cout <<"Character " << a << endl;
}
int main()
{
func('A');
func('A' + ' '); //A + space
}

void func(char a)
{
cout <<"Character " << a << endl;
}
void func(int a)
{
cout <<"Integer " << a << endl;
}
int main()
{
func('A'); //Statement 1
func('A' + ' '); //Statement 2
}

int add(int a = 5 , int b = 10);
int main( )
{
cout << add( 2 , 6) << endl;
cout << add( 2 ) << endl;
cout << add( ) << endl;
}
int add(int a = 5 , int b = 10)
{
return a + b;
}

Identify the valid and invalid Declarations
void func1(int a = 5 , int b = 10 ,int c = 20);
void func2(int a ,int b ,int c = 20);
void func3(int a = 5 ,int b ,int c );
void func4(int a = 5 ,int b = 10 ,int c );

void add(int a , int b = 5)
{
cout << “Add with 2 parameter”;
}
void add(int x)
{
cout <<“Add with 1 parameter”;
}
int main( )
{
add(5);
}

What is the header file to be included if you
want to use malloc and free?
What is the header file to be included if you
want to use new and delete?
Name some memory leakage detection tools?

int main( )
{
int *ptr = new int(5);
return 0;
}
int *ptr;
void func( )
{
ptr = new int[5];
}
int main( )
{
ptr = new int[5];
func( );
return 0;
}
int main( )
{
int *ptr = new int[5];
return 0;
}

C++ Question on References and Function Overloading

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