W3School TIY Editor

#include <stdio.h> #define READ 1 // 0001 #define WRITE 2 // 0010 #define EXEC 4 // 0100 int main() { int permissions = READ | WRITE; // 用户可以读和写 if (permissions & READ) { printf("允许读取\n"); } if (permissions & WRITE) { printf("允许写入\n"); } if (permissions & EXEC) { printf("允许执行\n"); } return 0; }