Swaping Two Numbers

Code ResourceAuthor: prabha

Difficulty Level:

Published: 12th Sep 2007 Read: 6190 times

Filed in: C++

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

Sample Code

void main()
{
int a,b;
printf("Enter any two no.s");
scanf("%d%d",&a,&b);
printf("nBefore swaping a=%d,b=%d",a,b);
a=a+b;
b=a-b;
a=a-b;
printf("n After swaping a=%d,b=%d",a,b);
getch();
}

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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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