#include<stdio.h>

extern "C"{ 
   int bitwise_not(int value);
} 

void setup(){}

void loop() {
    int a;  
    printf("Enter an integer to perform a bitwise NOT:\n");
    scanf("%d", &a);
    int result = bitwise_not(a);
    printf("Bitwise NOT of %d is: %d\n", a, result);
}