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Mail list
1. The address book can store 1000 Personal information
Everyone's information ：
name , Age , Gender , Telephone , Address
2. Increase people's information
3. Delete people's information
4. Modify the information of the designated person
5. Find the information of the designated person
6. Sort

Two 、 Implementation process

1. Create address book

1. Create header file contact.h

The header file contact.h Used to implement the definition of types and the declaration of functions .

2. Define the structure type （struct peoInfo）

A person's information contains a name , Age , Gender , Telephone , Address , So we need to define a structure type to complete the expression .

Write a structure type struct peoInfo Store a person's information

The code is as follows ：

/ The definition of type 
typedef struct peoInfo
{
	char name[MAX_NAME];// name 
	char sex[MAX_SEX];// Gender 
	int age;// Age 
	char tele[MAX_TELE];// Telephone 
	char addr[MAX_ADDR];// Address 
}peoInfo;

typedef（ Type renaming ）,struct peoInfo Rename it to peoInfo.

3. Define the address book structure type (struct contact)

Because it needs to be stored 1000 Information about such a person , So we create an array of structure types data. Create another variable sz To represent the subscript of this array ,data When the first personal information is stored in the array , We put the subscript sz The location of , At this time, let's sz be equal to 0, When saving the information of the second person , Let's have sz be equal to 1, In this way, it is convenient for us to find everyone's information stored by subscribing .

The code is as follows ：

peoInfo data[MAX];// Store the information of the added person 
	int sz;// It records the number of valid information in the address book

The above codes add up to form our address book , Obviously, this is also a structure .

The code is as follows ：

// Mail list 
typedef struct contact
{
	peoInfo data[MAX];// Store the information of the added person 
	int sz;// It records the number of valid information in the address book 
}contact;

4.#define Define identifier constants

For the convenience of adjusting the size of the address book at any time in the future, we use the numbers of the array one by one #define Define identifier constants

The code is as follows ：

#define MAX_NAME 20
#define MAX_SEX 10
#define MAX_TELE 12
#define MAX_ADDR 30
#define MAX 1000

5. Declaration of function implementation function

/ Initialize address book 
void Initcontact(contact* cp);

// Add contact information 
void AddContact(contact* cp);

// Print contact information 
void PintContact(const contact* cp);

// Delete contact information 
void DelContact(contact* cp);

// Find contact information 
void SearchContact(contact* cp);

// Modify contact information 
void ModifyContact(contact* cp);

2. Create the source file test.c

Source file test.c Test the module of the address book

After having the address book , We need to write the basic operation logic of the address book , Select Add Contact , Select Delete contact , Select Modify contact ...... Wrong choice , To choose , Choose to start over and so on .

1. Print menu

The code is as follows ：


void menu()
{
	printf("******************************\n");
	printf("*****1.add     2.del *********\n");
	printf("*****3.search  4.modify*******\n");
	printf("*****5.sort    6.print *******\n");
	printf("*****0.exit    ***************\n");
	printf("******************************\n");
}

2. Enumeration method definition number

The code is as follows ：

enum Option
{
	EXIT,
	ADD,
	DEL,
	SEARCH,
	MODIFY,
	SORT,
	PRINT
};

3. Implementation of master file

The code is as follows

int main()
{
	int input = 0;
	// Create address book 
	contact con;// Mail list 
	// Initialize address book 
	Initcontact(&con);
	do
	{
		menu();
		printf(" Please select :>");
		scanf("%d", &input);
		switch (input)
		{
		case ADD:
			// Increase people's information 
			AddContact(&con);
			break;
		case DEL:
			// Delete people's information 
			DelContact(&con);
			break;
		case SEARCH:
			// Find contact information 
			SearchContact(&con);
			break;
		case MODIFY:
			// Modify contact information 
			ModifyContact(&con);
			break;
		case SORT:
			break;
		case PRINT:
			// Print people's information 
			PintContact(&con);
			break;
		case EXIT:
			printf(" Log out \n");
			break;
		default:
			printf(" Wrong choice , Please reselect \n");
			break;
		}

	} while (input);
	return 0;
}

Write a menu for users to choose the functions they want , By enumerating, programmers can see the code at a glance , At a glance, you can also see what functions are to be realized here .

3. Create the source file contact.c

Source file contact.c To achieve what we want （ Implementation of function ）

1. Initialize the address book to 0（Initcontact Function implementation ）

// Initialize the address book to 0
void Initcontact(contact* cp)
{
	cp->sz = 0;// The number of people in the address book is initialized to 0
	memset(cp->data, 0, sizeof(cp->data));// Each byte in the array memory is initialized to 0

2. Add contact information in the address book （AddContact Function implementation ）

First judge whether the number of contacts is full , Cannot add when full , Add contact information before it is full .

The code is as follows ：

// Add contact information 
void AddContact(contact* cp)
{
	if (cp->sz == MAX)
	{
		printf(" The address book is full , Unable to add \n");
		return;
	}
	// Add a person's information 
	printf(" Please enter a name :>");
	scanf("%s", cp->data[cp->sz].name);
	printf(" Please enter age :>");
	scanf("%d", &(cp->data[cp->sz].age));
	printf(" Please enter gender :>");
	scanf("%s", cp->data[cp->sz].sex);
	printf(" Please input the phone number :>");
	scanf("%s", cp->data[cp->sz].tele);
	printf(" Please enter the address :>");
	scanf("%s", cp->data[cp->sz].addr);
	cp->sz++;
	printf(" Increase success \n");

}

3. Print address book contact information （ PintContact Function implementation ）

The code is as follows ：

// Print contact information 
void PintContact(const contact* cp)
{
	// Print title 
	int i = 0;
	printf("%-5s\t %-5s\t %-5s\t %-12s\t %-20s\n", " name ", " Age ", " Gender ", " Telephone ", " Address ");
	for (i = 0; i < cp->sz; i++)
	{
		printf("%-5s\t %-5d\t %-5s\t %-12s\t %-20s\n", 
			cp ->data[i].name,
			cp -> data[i].age,
			cp -> data[i].sex,
			cp -> data[i].tele,
			cp -> data[i].addr);
	}
}

After adding contact information, we can print it out and have a look .

4. Delete address book contact information （DelContact Function implementation ）

First, judge whether there are contacts in the address book , There is no need to delete , In some cases, you can delete the corresponding information by searching the name of the address book member according to the search function .

The code is as follows ：

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

// Delete contact information 
void DelContact(contact* cp)
{
	char name[MAX_NAME] = { 0 };
	if (cp->sz == 0)
	{
		printf(" Address book is empty , No need to delete \n");
		return;
	}
	//1. Find the person to delete 
	// Is there any 
	printf(" Please enter the name of the person you want to delete \n");
	scanf("%s", name);
	
	int pos = FindByName(cp, name);
	
		if (pos == -1)
		{
			printf(" The person to delete does not exist \n");
			return;
		}
		//2. Delete 
		int i = 0;
		for (i = pos; i < cp -> sz - 1; i++)
		{
			cp->data[i] = cp->data[i + 1];
		}
		cp->sz--;
		printf(" Delete successful \n");
		
}

5. Find address book contact information （ SearchContact Function implementation ）

Search the address book member name according to the search function to delete the corresponding information .

The code is as follows

/ Find contact information 
void SearchContact(contact* cp)
{
	char name[MAX_NAME] = { 0 };
	printf(" Please enter the name of the person you want to search for \n");
	scanf("%s", name);
	int pos = FindByName(cp, name);

	if (pos == -1)
	{
		printf(" The person you're looking for doesn't exist \n");
		return;
	}
	else 
	{
		printf("%-5s\t %-5s\t %-5s\t %-12s\t %-20s\n", " name ", " Age ", " Gender ", " Telephone ", " Address ");
		printf("%-5s\t %-5d\t %-5s\t %-12s\t %-20s\n",
			cp->data[pos].name,
			cp->data[pos].age,
			cp->data[pos].sex,
			cp->data[pos].tele,
			cp->data[pos].addr);

	}
}

6. Modify contact information （ModifyContact Function implementation ）

According to the search function, find the name of the address book member to modify the corresponding information .

The code is as follows ：

// Modify the contact's information 
void ModifyContact(contact* cp)
{
	char name[MAX_NAME] = { 0 };
	printf(" Please enter the name of the person you want to modify \n");
	scanf("%s", name);
	int pos = FindByName(cp, name);

	if (pos == -1)
	{
		printf(" The person to modify does not exist \n");
		return;
	}
	else 
	{
		printf(" Please enter a name :>");
		scanf("%s", cp->data[pos].name);
		printf(" Please enter age :>");
		scanf("%d", &(cp->data[pos].age));
		printf(" Please enter gender :>");
		scanf("%s", cp->data[pos].sex);
		printf(" Please input the phone number :>");
		scanf("%s", cp->data[pos].tele);
		printf(" Please enter the address :>");
		scanf("%s", cp->data[pos].addr);
		printf(" Modification successful \n");
		
	}
}

Partial function result diagram ：

summary ：

The above simply realizes the function of adding, deleting, modifying and checking the address book , Write a simple address book , If there are any questions about the above article , Welcome big guys to question , I will study and correct with an open mind , The most important thing is to make progress together , Grow up together , Learn to program well .

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