Some problems

Sheraz Khan · #1 (**permalink**) November 16th, 2007, 08:46 AM

If have two variables a=4 b=6 want to swap their values without using the third variable. How can I do this in C?

I want to make a pyramid of any shape (3D array) using loops?

Any answers with code will be really appreciated.

Cheers
Sheraz

liorm · #2 (**permalink**) November 16th, 2007, 01:59 PM

Swapin, enjoy..

Code:

//Swaping, add using for cout,endl..
int main(void)
{
 int a=321,b=258;
 cout << "Before swaping: a=" << a << " b=" << b << endl;
 a=a+b; 
 b=a-b; 
 a=a-b; 
 cout << "After Swaping: a=" << a << " b=" << b << endl;
 return 0;
}

gulina · #3 (**permalink**) November 18th, 2007, 07:10 AM

what a smart way:)

c.vikramnarayan · #4 (**permalink**) April 11th, 2008, 03:42 PM

int main()
{
int a=321,b=258;
cout << "Before swaping: a=" << a << " b=" << b << endl;
//Using bitwise ex-or operation
b^a^b^a;
cout << "After Swaping: a=" << a << " b=" << b << endl;
return 0;
}

Vikki