Swapping of Two Numbers

There are 4 methods of swapping of numbers.

Method : 1

By using 3rd variable....

int a=10,b=20,c;
c=a;
a=b;
b=c;
print(a,b);       // Now a=20 and b=10

Method : 2

Without using 3rd variable....
int a=10,b=20;
a=a+b;
b=a-b;
a=a-b;
print(a,b);    // Now a=20 and b=10

Method :3

Using multiplication and division method....
int a=10,b=20;
a=a*b;
b=a/b;
a=a/b;
print(a,b);    // Now a=20 and b=10

Method :4

Best method for swapping using XOR Gate
int a=10,b=20;
a=a^b;
b=a^b;
a=a^b;
print(a,b);    // Now a=20 and b=10

Method 4 is best method for swapping. Because others are fail to swap in certain conditions like Method 3 is fail if value of int b is 0 and Method 2 is fail if addition or subtraction crosses to its maximum limit.