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Swap two numbers without using third

CODING:
#include <stdio.h>
void main()
{
int a,b;

 printf("Enter a and b");
scanf("%d",a);
scanf("%d",b);

 printf("Before Swapping a=%d,b=%d"a,b);
a=a+b;
b=a-b;
a=a-b;

 printf("After Swapping a=%d,b=%d"a,b);
}

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