乾貨，程式碼貼出來：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

char *menu[] =
{
	"a - add new record",
	"d - delete record",
	"q -quit",
	NULL,
};

int getchoice(char *greet, char *choicess[]);

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++;
		}	
		do{
			selected = getchar();
			option = choices;
		}while(selected =='\n');
		while(*option)
		{
			if (selected == *option[0])
			{
				chosen = 1;
				break;
			}
			option++;
		}
		if(!chosen)
		{
			printf("Incorrect choice, select again \n");
		}
	}
	while(!chosen);
	return selected;
	
}