~cpp 
#include <stdio.h>
#include <string.h>

const int MAX_DATA_SIZE=100;
const int HANG_MOK=4;
const int MAX_MENU=8;
const int QUIT=6;
const char menu[MAX_MENU][20]={"insert","modify","delete","undelete","search","list","quit","?"};
const char print_outs[HANG_MOK][5]={"id","name","tel","add"};
const int MAX_BLOCK_SIZE=256;
const int FALSE=-1;
const int ALL=-1;

char datas[MAX_DATA_SIZE+1][HANG_MOK][MAX_BLOCK_SIZE];
int how_many_data=0;
int prv_del=-1;

int select_menu();
void function_insert();void function_modify();void function_delete();void function_undelete();void function_search();void function_list();void function_quit();void function_help();
int such_data();
void print_list(int);
void modify_data(int);
void print_cursur();

void main()
{
	void (*functions[MAX_MENU])(void)={function_insert,function_modify,function_delete,function_undelete,function_search,function_list,function_quit,function_help};
	while (1)
	{
		int selected_number=select_menu();
		functions[selected_number]();
		if (QUIT==selected_number)
			break;
	}
}

int select_menu()
{
	char temp_input[20];
	while (1)
	{
		print_cursur();
		scanf("%s",temp_input);
		for (register int i=0; i<MAX_MENU; ++i)
		{
			if (0==strcmp(temp_input,menu[i]))
				return i;
		}
		printf ("ERROR!! - code:00 - Wrong order!!\n");
	}
}

void function_insert()
{
	if (MAX_DATA_SIZE==how_many_data)
		printf("ERROR!! - code:03 - data overflow!!\n");
	else
	{
		modify_data(how_many_data);
		++how_many_data;
	}
}

void function_modify()
{
	int target=such_data();
	if (FALSE!=target)
		modify_data(target);
}

void function_delete()
{
	int target=such_data();
	if (FALSE!=target)
	{
		for (register int i=0; i<HANG_MOK; ++i)
			strcpy(datas[MAX_DATA_SIZE][i],datas[target][i]);
		for (register int i=target+1; i<how_many_data; ++i)
		{
			for (register int j=0; j<HANG_MOK; ++j)
				strcpy(datas[i-1][j],datas[i][j]);
		}
		--how_many_data;
		prv_del=target;
	}
}

void function_undelete()
{
	if (-1==prv_del)
		printf("ERROR!! - code:02 - Can't find deleted data!!\n");
	else
	{
		for (register int i=how_many_data-1; prv_del<=i; --i)
		{
			for (register int j=0; j<HANG_MOK; ++j)
				strcpy(datas[i+1][j],datas[i][j]);
		}
		for (register int i=0; i<HANG_MOK; ++i)
			strcpy(datas[prv_del][i],datas[MAX_DATA_SIZE][i]);
		++how_many_data;
		prv_del=-1;
	}
}

void function_search()
{
	int target=such_data();
	if (FALSE!=target)
		print_list(target);
}

void function_list()
{
	print_list(ALL);
}

void function_quit()
{
	printf ("Goodbye~\n");
}

void function_help()
{
	printf("Menu: ");
	for (register int i=0; i<MAX_MENU; ++i)
		printf(" %s ",menu[i]);
	printf("\n");
}

int such_data()
{
	int select_number;
	char temp_data[MAX_BLOCK_SIZE];
	printf("select number : ");
	for (register int i=0; i<HANG_MOK; ++i)
		printf("%d. %s\t",i,print_outs[i]);
	printf("\n");
	print_cursur();
	scanf("%d",&select_number);
	printf("content? ");
	scanf("%s",temp_data);
	for (register int i=0; i<how_many_data; ++i)
	{
		if (0==strcmp(temp_data,datas[i][select_number]))
			return i;
	}
	printf("ERROR!! - code:01 - Can't find!!\n");
	return FALSE;
}

void print_list(int number)
{
	for (register int i=0; i<HANG_MOK; ++i)
		printf("%s\t",print_outs[i]);
	printf("\n");
	if (ALL==number)
	{
		for (register int i=0; i<how_many_data; ++i)
		{
			for (register int j=0; j<HANG_MOK; ++j)
				printf("%s\t",datas[i][j]);
			printf("\n");
		}
	}
	else
	{
		for (register int j=0; j<HANG_MOK; ++j)
			printf("%s\t",datas[number][j]);
		printf("\n");
	}
}

void modify_data(int target)
{
	for (register int i=0; i<HANG_MOK; ++i)
	{
		printf("%s? ",print_outs[i]);
		scanf("%s",datas[target][i]);
	}
}

void print_cursur()
{
	printf(">>");
}