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#include "stdio.h"
int main()
{
        int  a,b;
        a=1;
        b=2;
        a = a ^ b;
        b = a ^ b;
        a = a ^ b;
        printf("a=%d,b=%d",a,b);
        return 0;
}

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int a,b,c;
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c=a;b=a;b=c;
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