#include <stdio.h>
#include <inttypes.h>
#define SWAP(a,b) do ((&(a))!=(&(b)))?((a)^=(b)^=(a)^=(b)):((a)=(a)); while (0)
char   *p1="1" ,*p2="2" ;
char    c1=1   , c2=2   ;
short   s1=1   , s2=2   ;
int     i1=1   , i2=2   ;
int64_t I1=1ll, I2=2ll;
float   f1=1.0f, f2=2.0f;
double  d1=1.0 , d2=2.0 ;
int main() {
    SWAP(*(int*)&p1,*(int*)&p2);                printf("char *     %5s,   %5s\n",p1,p2);
    SWAP(c1,c2);                          printf("char       %5d,   %5d\n",c1,c2);
    SWAP(s1,s2);                          printf("short      %5d,   %5d\n",s1,s2);
    SWAP(i1,i2);                          printf("int        %5d,   %5d\n",i1,i2);
    SWAP(I1,I2);                          printf("__int64 %5lld,%5lld\n",I1,I2);
    SWAP(*(int     *)&f1,*(int     *)&f2);printf("float      %5g,   %5g\n",f1,f2);
    SWAP(*(int64_t *)&d1,*(int64_t *)&d2);printf("double    %5lg,  %5lg\n",d1,d2);

    SWAP(c1,c1);
    printf("%d\n",c1);
}