Page 247 - DCAP404 _Object Oriented Programming

Object-oriented Programming

Notes temp = *x;
*x = *y;
*y = temp;
}
Output: Original values
a = 7, b = 4

Swapped values
a = 4, b= 7

Notes The called function does not create own copy of original values by the addresses
(passed through pointers) it receives.

11.4.2 Function Returning Pointers

The way a function can returns an int, a float, a double, or reference or any other data type, it can
even return a pointer. However, the function declaration must replace it. That is, it should be
explicitly mentioned in the function’s prototype. The general form of prototype of a function
returning a pointer would be type function-name (argument list);
The return type of a function returning a pointer must be known because the pointer arithmetic
is relative to its base type and a complier must know what type of data the pointer is pointing to
in order to make it point to the next data item.

Example: Program to illustrate a function returning a pointer.
#include<iostream.h>
#include<conio.h>
int *big(int&, int&) //prototype
int main( )
{ clrscr( )

int a, b, *c;
cout<<“Enter two integers \n”;
cin>>a>>b;
c= big(a, b);
cout<<“The bigger value is “<< *c<< “\n”;
return 0;
}

int *big(int &x, int &y)
{ if (x>y)
return(&x);

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