#include <unistd.h>#include <stdio.h>char *menu[] = {    "a - add new record",    "d - delete record",    "q - quit",    NULL,};int getchoice(char *greet, char *choices[]);int main(){    int choice = 0;    if(!isatty(fileno(stdout))) {        fprintf(stderr,"You are not a terminal!\n");        exit(1);    }    do    {        choice = getchoice("Please select an action", menu);        printf("You have chosen: %c\n", choice);    } while (choice != 'q');    exit(0);}int getchoice(char *greet, char *choices[]){    int chosen = 0;    int selected;    char **option;    do {        printf("Choice: %s\n",greet);        option = choices;        while(*option) {            printf("%s\n",*option);            option++;        }        selected = getchar();        option = choices;        while(*option) {            if(selected == *option[0]) {                chosen = 1;                break;            }            option++;        }        if(!chosen) {            printf("Incorrect choice, select again\n");        }    } while(!chosen);    return selected;}