#include <stdio.h> #define READ 1 // 0001 #define WRITE 2 // 0010 #define EXEC 4 // 0100 int main() { int permissions = READ | WRITE; // user can read and write if (permissions & READ) { printf("Read allowed\n"); } if (permissions & WRITE) { printf("Write allowed\n"); } if (permissions & EXEC) { printf("Execute allowed\n"); } return 0; }