C library - <iso646_h.htm>

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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.

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

Example 1

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

The above code produces the following result −

Sum of 5 and 3 = 1

Example 2

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

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

After swapping: x = 3, y = 5

Example 3

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

After executing the code, we get the following result −

Logical AND of 1 and 0 = 0