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Swaping Two Numbers


Code ResourceAuthor: prabha  

Difficulty Level:

Published: 12th Sep 2007   Read: 2485 times  

Filed in: C++
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Swaping of two Numbers without 3rd variable in C++.

 


Sample Code
  1.  
  2. void main()
  3. {
  4.    int a,b;
  5.    printf("Enter any two no.s");
  6.    scanf("%d%d",&a,&b);
  7.    
  8.    printf("nBefore swaping a=%d,b=%d",a,b);
  9.    a=a+b;
  10.    b=a-b;
  11.    a=a-b;
  12.    printf("n After swaping a=%d,b=%d",a,b);
  13.    getch();
  14. }
  15.  
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Comments

Great and logically correct
Comment posted by: babu_krishi on 2007-10-09T05:37:58
1) int main() invokes undefined behavior.
2) The method poses overflow problems, so swapping two numbers which are greater than half of the limited int size gives incorrect result.
A better method for swapping two integers a and b is
a^=b;
b^=a;
a^=b;
Comment posted by: jagatsastry on 2007-10-22T02:03:48

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