#include <stdio.h> #include <stdlib.h> int main() { char line[10]; while (1) { printf("Enter add(a), delete(d), quit(q): "); fgets(line, sizeof(line), stdin); switch (line[0]) { case 'a': printf("Add\n"); break; case 'd': printf("Delete\n"); break; case 'q': printf("Quit\n"); exit(0); defualt: printf("Error:Bad command %c\n", line[0]); break; } } }