C語言：兩數交換 (Swap in C)

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#include<stdio.h>

#include<stdlib.h>

voidswap( void*a, void*b, size_t size );

intmain(void)

{

  doublehi = 12.345, good = 543.21;

  printf( "hi = %lf\tgood = %lf\n", hi, good );

  swap( &hi, &good, sizeof(double) );

  printf( "hi = %lf\tgood = %lf\n", hi, good );

  return0;

}

// byte-by-byte swap

voidswap( void*a, void*b, size_t size )

{

  size_t i;

  char*p = (char*)a;

  char*q = (char*)b;

  chartemp;

  for( i = 0; i < size; i++, p++, q++ )

  {

    temp = *p;

    *p = *q;

    *q = temp;

  }

}