使用临时变量
以下实例演示了交换两个浮点数的值。
实例

include

int main()
{
double firstNumber, secondNumber, temporaryVariable;

  printf("输入第一个数字: ");
  scanf("%lf", &firstNumber);

  printf("输入第二个数字: ");
  scanf("%lf",&secondNumber);

  // 将第一个数的值赋值给 temporaryVariable
  temporaryVariable = firstNumber;

  // 第二个数的值赋值给 firstNumber
  firstNumber = secondNumber;

  // 将 temporaryVariable 赋值给 secondNumber
  secondNumber = temporaryVariable;

  printf("\n交换后, firstNumber = %.2lf\n", firstNumber);
  printf("交换后, secondNumber = %.2lf", secondNumber);

  return 0;

}
运行结果：

输入第一个数字: 1
输入第二个数字: 2

交换后, firstNumber = 2.00
交换后, secondNumber = 1.00