author ： A collection of old dreams 186

special column ：C Language programming ---- Little bit's Growth Diary

Related links ： File operation （C Language )

Daily inspirational ：

Life will never fail anyone , Make yourself busy when you feel sad , The world has not become smaller , We must make ourselves more and more lovely to live , Don't waste your life , But enjoy life .

Catalog

Preface ：

The design requirements ：

preparation ：

File address book

​ edit

Preface ：

We have finished the previous two chapters on file operation , Today, in order to consolidate the knowledge of file operation , We specially practiced the address book of document class .

The design requirements ：

The address book we designed must meet the following requirements ：

1. Use static memory to open up the address book , The initial default size of the address book is 1000 Contact type .

    Use dynamic memory to open up the address book , The initial default size of the address book is 3 Contact types .
2. Contact information includes ： full name 、 Gender 、 Age 、 Telephone 、 address .
3. The address book has the function of adding contacts .
4. The address book has the function of deleting contacts .
5. The address book has the function of finding contacts by name and outputting all the information of this contact .
6. The address book has the function of modifying contact information .
7. The address book has the function of sorting by age .
8. The address book has all contact information cleared 、 Functions of memory .
9. The address book has the function of displaying the address book .
 

preparation ：

Static address book and dynamic address book , The layout required is basically the same

use , In a modular way, we need to create test.c,contact.c and contact.c file

among test.c Is the entry of the main function ,contact.c It is the realization of function ,contact.c It's a function declaration , Use of structure declarations and header files .

File address book

The reason why I write file address book , It's because whether it's a static address book or a dynamic address book , The information entered each time cannot be saved , After exiting the address book, the message disappears , Have to re-enter . The emergence of file address book can solve this problem .

The file version address book is improved on the basis of the dynamic version address book , We need to save the information before exiting the address book , And we need to be able to load files after each initialization , Let the address book have information . This is the biggest difference ！

test.c

#define _CRT_SECURE_NO_WARNINGS

#include "contact.h"


/*
*  Add contact information 
 Delete the specified contact information 
 Find the specified contact information 
 Modify designated contact information 
 Show all contact information 
 Clear all contacts 
 Sort all contacts by name 
*/


enum option
{
	EXIT,
	ADD,
	DEL,
	SEARCH,
	MODIFY,
	SHOW,
	CLEAR,
	SORTNAME
};

void menu()
{
	printf("*******************************************\n");
	printf("******    1.add                2.del ******\n");
	printf("******    3.search             4.modify****\n");
	printf("******    5.show               6.clear  ****\n");
	printf("******    7.sortName           0.exit *****\n");
	printf("*******************************************\n");

}
int main()
{
	int input = 0;
	Contact con;
	InitContact(&con);
	do
	{
		menu();
		printf(" Please select ：>");
		scanf("%d", &input);
		switch (input)
		{
		case ADD:
			AddContact(&con);
			break;
		case DEL:
			DelContact(&con);
			break;
		case SEARCH:
			SearchContact(&con);
			break;
		case MODIFY:
			ModifyContact(&con);
			break;
		case SHOW:
			ShowContact(&con);
			break;
		case CLEAR:
			ClearContact(&con);
			break;
		case SORTNAME:
			SortContact(&con);
			break;
		case EXIT:
			// Save information to file 
			SaveContact(&con);
			// Destroy the address book 
			DestroyContact(&con);
			printf(" Exit address book \n");
			break;
		default:
			printf(" Wrong choice \n");
			break;
		}
	} while (input);
	return 0;
}

contact.h

#define _CRT_SECURE_NO_WARNINGS


#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>


#define DEFAULT_SZ 3
#define INC_SZ 2
#define MAX 1000
#define MAX_NAME 20
#define MAX_SEX 10
#define MAX_TELE 12
#define MAX_ADDR 30
typedef struct PeoInfo
{
	char name[MAX_NAME];
	int age;
	char sex[MAX_SEX];
	char tele[MAX_TELE];
	char addr[MAX_ADDR];
}PeoInfo;


//typedef struct Contact
//{
//	PeoInfo data[MAX];
//	int count;
//}Contact;

// Dynamic version 
typedef struct Contact
{
	PeoInfo* data;
	int count;
	int capacity;
}Contact;

// initialization 
int InitContact(Contact* pc);

// add to 
void AddContact(Contact* pc);

// Print 
void ShowContact(const Contact* pc);

// Delete 
void DelContact(Contact* pc);

// lookup 
void SearchContact(Contact* pc);

// modify 
void ModifyContact(Contact* pc);

// Empty 
void ClearContact(Contact* pc);

// Sort 
void SortContact(Contact* pc);


// The destruction 
void DestroyContact(Contact* pc);


// Save address book information to a file 
void SaveContact(Contact* pc);

// Load the contents of the file into the address book 
void LoadContact(Contact* pc);

//
void CheckCapacity(Contact* pc);

contact.c

#define _CRT_SECURE_NO_WARNINGS

#include "contact.h"

void LoadContact(Contact* pc)
{
	FILE* pf = fopen("contact.dat", "r");
	if (pf == NULL)
	{
		perror("LoadContact");
		return;
	}
	// Reading documents 
	PeoInfo tmp = { 0 };
	while (fread(&tmp, sizeof(PeoInfo), 1, pf))
	{
		// Whether to increase capacity 
		CheckCapacity(pc);
		pc->data[pc->count] = tmp;
		pc->count++;
	}
	// Close file 
	fclose(pf);
	pf = NULL;
}

int InitContact(Contact* pc)
{
	assert(pc);
	pc->count = 0;
	pc->data = (PeoInfo*)calloc(3, sizeof(PeoInfo));
	if (pc->data == NULL)
	{
		printf("InitContact:%s\n", strerror(errno));
		return 1;
	}
	pc->capacity = DEFAULT_SZ;

	// Load the file 
	LoadContact(pc);

	return 0;
}


void CheckCapacity(Contact* pc)
{
	if (pc->count == pc->capacity)
	{
		PeoInfo* ptr = realloc(pc->data, (pc->capacity + INC_SZ) * sizeof(PeoInfo));
		if (ptr == NULL)
		{
			printf("ADDContact:%s\n", strerror(errno));
			return;
		}
		else
		{
			pc->data = ptr;
			pc->capacity += INC_SZ;
			printf(" Successful expansion \n");
		}
	}
}

// Dynamic version 
void AddContact(Contact* pc)
{
	assert(pc);
	CheckCapacity(pc);
	printf(" Please enter a name ：");
	scanf("%s", pc->data[pc->count].name);
	printf(" Please enter age ：");
	scanf("%d", &pc->data[pc->count].age);
	printf(" Please enter gender ：");
	scanf("%s", pc->data[pc->count].sex);
	printf(" Please input the phone number ：");
	scanf("%s", pc->data[pc->count].tele);
	printf(" Please enter the address ：");
	scanf("%s", pc->data[pc->count].addr);

	pc->count++;
	printf(" Increase success \n");
}



void ShowContact(const Contact* pc)
{
	assert(pc);
	int i = 0;
	printf("%-20s\t%-5s\t%-5s\t%-12s\t%-30s\n", " name ", " Age ", " Gender ", " Telephone ", " Address ");
	for (i = 0; i < pc->count; i++)
	{
		printf("%-20s\t%-3d\t%-5s\t%-12s\t%-30s\n", pc->data[i].name, pc->data[i].age,
			pc->data[i].sex, pc->data[i].tele, pc->data[i].addr);
	}
}

static int FindByName(Contact* pc, char name[])
{
	assert(pc);
	int i = 0;
	for (i = 0; i < pc->count; i++)
	{
		if (0 == strcmp(pc->data[i].name, name))
		{
			return i;
		}
	}
	return -1;
}

void DelContact(Contact* pc)
{
	char name[MAX_NAME] = { 0 };
	assert(pc);
	int i = 0;
	if (pc->count == 0)
	{
		printf(" Address book is empty , No information can be deleted \n");
		return;
	}
	printf(" Please enter the name of the person you want to delete :>");
	scanf("%s", name);

	// lookup 
	int pos = FindByName(pc, name);

	if (pos == -1)
	{
		printf(" The person to delete does not exist \n");
		return;
	}
	// Delete 
	for (i = pos; i < pc->count - 1; i++)
	{
		pc->data[i] = pc->data[i + 1];
	}
	pc->count--;
	printf(" Delete successful \n");
}


void SearchContact(Contact* pc)
{
	char name[MAX_NAME] = { 0 };
	assert(pc);
	printf(" Please enter the name of the person you want to search for ：>");
	scanf("%s", name);
	int pos = FindByName(pc, name);
	if (pos == -1)
	{
		printf(" The person you're looking for doesn't exist \n");
		return;
	}
	else
	{
		printf("%-20s\t%-5s\t%-5s\t%-12s\t%-30s\n", " name ", " Age ", " Gender ", " Telephone ", " Address ");
		printf("%-20s\t%-3d\t%-5s\t%-12s\t%-30s\n", pc->data[pos].name, pc->data[pos].age,
			pc->data[pos].sex, pc->data[pos].tele, pc->data[pos].addr);
	}

}


void ModifyContact(Contact* pc)
{
	char name[MAX_NAME] = { 0 };
	assert(pc);
	printf(" Please enter the name of the person you want to modify ：>");
	scanf("%s", name);
	int pos = FindByName(pc, name);
	if (pos == -1)
	{
		printf(" The person to modify does not exist \n");
		return;
	}
	else
	{
		printf(" Please enter a name ：");
		scanf("%s", pc->data[pos].name);
		printf(" Please enter age ：");
		scanf("%d", &pc->data[pos].age);
		printf(" Please enter gender ：");
		scanf("%s", pc->data[pos].sex);
		printf(" Please input the phone number ：");
		scanf("%s", pc->data[pos].tele);
		printf(" Please enter the address ：");
		scanf("%s", pc->data[pos].addr);
		printf(" Modification successful \n");
	}

}


void ClearContact(Contact* pc)
{
	assert(pc);
	pc->count = 0;
	memset(pc->data, 0, sizeof(pc->data));
	printf(" Empty successfully ！\n");

}



int cmp_by_name(const void* e1, const void* e2)
{
	return strcmp(((PeoInfo*)e1)->name, ((PeoInfo*)e2)->name);
}
void SortContact(Contact* pc)
{
	assert(pc);
	for (int i = 0; i < pc->count - 1; i++)
	{
		qsort(pc->data, pc->count, sizeof(pc->data[0]), cmp_by_name);
	}
	printf(" Sort success ！\n");
}



void DestroyContact(Contact* pc)
{
	assert(pc);
	free(pc->data);
	pc->data = NULL;

}



void SaveContact(Contact* pc)
{
	FILE*pf = fopen("Contact.dat", "w");
	if (pf == NULL)
	{
		perror("SaveContact");
		return;
	}
	// Writing documents 
	int i = 0;
	for (i = 0; i < pc->count; i++)
	{
		fwrite(pc->data + i, sizeof(PeoInfo), 1, pf);
	}
	// Close file 
	fclose(pf);
	pf = NULL;
}

Conclusion ：

Everyone's growth is ability and what he wants , Continuous matching process , When your talent doesn't match your desire , You should calm down and study , If Xiaobian's summary can help you , I hope you guys will pay more attention for three consecutive days , Your support is the biggest motivation for Xiaobian's creation .