write a program to interchange the values of 2 variables without using 3rd variable?

Question

write a program to interchange the values of 2 variables without using 3rd variable

Answer 1

You can do it by addition and subtraction of the existing values (shown as x and y here):



x = x + y

y = x – y

x = x – y

Answer 2

let x =10 and y = 20

then for interchange

x=x+y //x=10+20=30

y=x-y //y=30-20=10

x values is interchanged

and

x=x-y //x=30-10=20

value of x and y is interchanged

Answer 3

-> Swapping with third variable #contain #contain void substantial() { int a, b; clrscr(); printf("enter the two numbers:"); scanf("%dp.c.d",&a,&b); printf("Values in the past swapping are:%dp.c.d",a,b); int t; t=a; a=b; b=t; printf("The values after swapping are:%dp.c.d",a,b); getch(); } ->Swapping without the third variable #contain #contain void substantial() { int a, b; clrscr(): printf("enter the two numbers:"); scand("%dp.c.d",&a,&b); printf("Values in the past swapping are:%dp.c.d",a,b); a=a+b; b=a-b; a=a-b; printf("The values after swapping arep.c.dp.c.d",a,b); } desire this permits........:)

Answer 4

This might help you: http://en.wikipedia.org/wiki/Swap_%28computer_science%29

Would've been good to know what language you're using.