## Exchange two variable without third variable

This looks very tricky but not very hard to think a logic for this. Let say we have two variables A and B. Now we can add them and store in A. At this point A contains value of A plus B i.e. A = A + B. Now say subtract B from it (A - B). We can get value of A and store it in B i.e. B = A - B. Now B contains value of A. We are almost half done. Now subtract B from it which is actually contains value of A to get the value of B in A i.e. A = A - B. We are done exchange these two. Let construct a C program.## Source Code

**#include**<stdio.h>

**int**main (

**int**argc,

**char***argv[])

**int**A = 1, B = 2;

**return**(0);

## Output

A = 2, B = 1 Exchanging A <> B A = 1, B = 2 A = -2, B = -1 Exchanging A <> B A = -1, B = -2

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