# <iso646.h>

**[<iso646.h>](https://en.cppreference.com/w/c/header/iso646)** provides alternative spellings for operators as macros: `and` for `&&`, `or` for `||`, `not` for `!`, `bitand` for `&`, etc. It exists for platforms where these symbols were assigned to other characters.

In C++, these are built-in keywords; in C, you need this header. Rarely needed on modern systems.

## Example

This example uses operator alternative spellings to demonstrate they work identically to symbols.

```c
// compile: gcc -o iso646example iso646example.c
// run: ./iso646example
// description: use iso646.h operator alternatives

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

int main() {
    int a = 1, b = 0;
    
    if (a and not b)
        printf("a is true and b is false\n");
    
    unsigned x = 0xFF;
    unsigned y = x bitand 0x0F;
    unsigned z = y bitor 0xF0;
    printf("x=0x%02X  y=0x%02X  z=0x%02X\n", x, y, z);
    
    return 0;
}
```