C Standard Library 简明教程

C library - <iso646_h.h>

C 库头文件 <iso646_h.htm> 允许替代运算符，例如 and 、 xor 、 not 等，这些运算符会返回特定值。例如，在布尔表达式中使用 "and" 而不是 && 可以使代码更具可读性。

The C library header <iso646_h.htm> allows the alternative operators such as and, xor, not, etc which return the specific value. For example, using "and" instead of && in boolean expressions can make the code more readable.

有十一种宏是从头文件 iso646.h 派生的 −

There are eleven macros which are derieved from the header iso646.h −

Example

以下是 C 库头文件 <iso646_h.htm>，以查看使用替代运算符('and')的两个数字的演示。

Following is the C library header <iso646_h.htm> to see the demonstration of two number using alternative('and') operator.

#include <stdio.h>
#include <iso646.h>

int main() {
   int a = 5;
   int b = 3;

   // Using the alternative 'and' operator
   int sum = a and b;

   printf("Sum of %d and %d = %d\n", a, b, sum);
   return 0;
}

Output

以上代码生成以下结果 −

The above code produces the following result −

Sum of 5 and 3 = 1

Example

我们创建一个程序，使用替代运算符 (xor) 交换两个数字。

We create a program for swapping two numbers using alternative operators(xor).

#include <stdio.h>
#include <iso646.h>

int main() {
   int x = 5;
   int y = 3;

   // Using the alternative 'xor' operator
   x = x xor y;
   y = x xor y;
   x = x xor y;

   printf("After swapping: x = %d, y = %d\n", x, y);
   return 0;
}

Output

执行以上代码，将获得以下结果 −

On execution of above code, we get the following result −

After swapping: x = 3, y = 5

Example

下面的程序使用替代运算符计算两个值的逻辑 " and "。

Below the program calculate the logical "and" of two values using alternative operator.

#include <stdio.h>
#include <iso646.h>
int main() {
    int bool1 = 1;
    int bool2 = 0;

    int result = bool1 and bool2;

    printf("Logical AND of %d and %d = %d\n", bool1, bool2, result);
    return 0;
}

Output

执行代码后，我们会得到以下结果 −

After executing the code, we get the following result −

Logical AND of 1 and 0 = 0