menu.c

#include<stdio.h>

#define DESC_LEN 50
#define CMD_NUM 10

typedef struct DataNode
{
	int cmd;
	char descpt[DESC_LEN];
  struct DataNode* next;
} tDataNode;

int main()
{
	tDataNode *head = NULL;
	tDataNode *p = NULL;
	int i;	
	/* Init Command List */
	for(i=0; i<CMD_NUM; i++)
	{
		p = (tDataNode*)malloc(sizeof(tDataNode));
		p->cmd = i;
		snprintf(p->descpt, DESC_LEN, "This is Command %d.", i);
		p->next = head;
		head = p;	
	}
	printf("Menu List:\n");
	p = head;
	while(p != NULL)
	{
		printf("%d--%s\n", p->cmd, p->descpt);
		p = p->next;
	} 
	/* Command Line begins */
	while(1)
	{
		int cmd;
		printf("Input a cmd number>");
		scanf("%d", &cmd);
		if(cmd >= CMD_NUM)
		{
			printf("This is a wrong commad!\n");
			continue;
		}
		
		p = head;
		while(p != NULL)	
		{
			if(cmd == p->cmd)
			{
				printf("%s\n", p->descpt);
				break;
			}
			p = p->next;
		}
	}

    return 0;
}