Visual C++ >> Console

交換變數(無需暫存變數)

---

透過temp變數

#include <stdio.h>

int main(int argc, char** argv)
{
  int a, b, temp;

  a = 1;
  b = -2;

  printf("before: a=%d, b=%d\n", a, b);
  temp = a;
  a = b;
  b = temp;
  printf("after: a=%d, b=%d\n", a, b);

  return 0;
}

結果

before: a=1, b=-2
after: a=-2, b=1

不使用temp變數

#include <stdio.h>

int main(int argc, char** argv)
{
  int a, b;

  a = 1;
  b = -2;

  printf("before: a=%d, b=%d\n", a, b);
  a = a ^ b;
  b = a ^ b;
  a = a ^ b;
  printf("after: a=%d, b=%d\n", a, b);

  return 0;
}

結果

before: a=1, b=-2
after: a=-2, b=1

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