C language structure to realize simple address book

Implemented function

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

The complete procedure is as follows ：

1. The header file ：

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

#include<string.h>

#define MAX_NAME 20
#define MAX_SEX 10
#define MAX_TEL 12
#define MAX_ADDR 30

#define MAX 1000


// Define the structure type of personal information 
typedef  struct PeoInfo
{
    
	char name[MAX_NAME];
	char sex[MAX_SEX];
	int age;
	char tel[MAX_TEL];
	char addr[MAX_ADDR];
}PeoInfo;


// Define the address book structure type 
typedef struct Contact
{
    
	PeoInfo  data[MAX];// The address book can store MAX Personal information 
	int sz;// Record the number of copies of personal information 
}Contact;


// Initialize address book 
void  InitContact(Contact*);
// Add new contact 
void  AddContact(Contact*);
// Delete Contact 
void DelContact(Contact*);
// Find contacts 
void SearchContact(Contact*);
// Modify contact information 
void ModifyContact(Contact*);
// Show contact information 
void PrintContact(Contact*);
// Sort contacts by name 
void SortContact(Contact*);

2. Function implementation file ：

#define _CRT_SECURE_NO_WARNINGS 1
#include"contact.h"


void InitContact(Contact* pc)
{
    
	pc->sz = 0;
	memset(pc->data, 0, sizeof(pc->data));
}

void  AddContact(Contact* pc)
{
    
	if (pc->sz == MAX)
	{
    
		    printf(" The address book is full ");
			return ;
	}
	        printf(" Please enter contact name :>");
	        scanf("%s", pc->data[pc->sz].name);
	        printf(" Please enter the gender of the contact person :>");
			scanf("%s", pc->data[pc->sz].sex);
			printf(" Please enter the contact age :>");
			scanf("%d", &(pc->data[pc->sz].age));
			printf(" Please enter the contact number :>");
			scanf("%s", pc->data[pc->sz].tel);
			printf(" Please enter contact address :>");
			scanf("%s", pc->data[pc->sz].addr);

			pc->sz++;
			printf(" Add contact succeeded \n");
}

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

void DelContact(Contact* pc)
{
    
	char name[MAX_NAME] = {
     0 };
	if (pc->sz == 0)
	{
    
		printf(" No contacts to delete ");
		return;
	}
		printf(" Please enter the contact name to delete ");
			scanf("%s", name);
		
		// Find this person 
			int pos = FindByName(pc, name);
			if (pos == -1)
			{
    
				printf(" There is no contact information \n");
				return;
			}
			// If there is such contact , Delete 
			int i = 0;
			for (i = pos; i < pc->sz - 1; i++)
			{
    
				pc->data[i] = pc->data[i + 1];  // Structure can be assigned directly 
			}
			pc->sz--;
			printf(" Delete successful \n");
}

void SearchContact(Contact* pc)
{
    
	    char name[MAX_NAME];
	    printf(" Please enter the name of the contact you want to find ");
		scanf("%s", name);
		int pos = FindByName(pc, name);
		if (pos == -1)
		{
    
			printf(" No such contact ");
			return;
		}
		else
		{
    
			printf("%-12s\t %-5s\t %-5s\t %-12s\t %-20s\n ",
				          " full name "," Gender ", " Age ", " Telephone ", " Address ");
			printf("%-10s\t %-5s\t %-5d\t %-15s\t %-20s\n ",
				              pc->data[pos].name,
				              pc->data[pos].sex,
				              pc->data[pos].age,
				              pc->data[pos].tel,
				              pc->data[pos].addr
				      );
		}

}

void ModifyContact(Contact* pc)
{
    
	char name[MAX_NAME] = {
     0 };
	printf(" Please enter the contact name to modify ");
	scanf("%s", name);
	int pos = FindByName(pc, name);
	if (pos == -1)
	{
    
		printf(" No such contact \n");
		return;
	}
	else
	{
    
		printf(" Please enter contact name :>");
		scanf("%s", pc->data[pos].name);
		printf(" Please enter the gender of the contact person :>");
		scanf("%s", pc->data[pos].sex);
		printf(" Please enter the contact age :>");
		scanf("%d", &(pc->data[pos].age));
		printf(" Please enter the contact number :>");
		scanf("%s", pc->data[pos].tel);
		printf(" Please enter contact address :>");
		scanf("%s", pc->data[pos].addr);

		printf(" Contact modified successfully \n");
	}
}

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

}

void SortContact(Contact*  pc)
{
    
	int i = 0, j = 0;
	Contact temp;
	InitContact(&temp);
	for (int i = 0; i < pc->sz - 1;i++)
	for (int j = 0; j < pc->sz - i-1; j++)
	{
    
		if (strcmp(pc->data[j].name, pc->data[j+1].name) > 0)
		{
    
			temp.data[j] = pc->data[j + 1];
			pc->data[j+1] = pc->data[j ];
			pc->data[j] = temp.data[j];
		}
	}
}

3. Main function file ：

#define _CRT_SECURE_NO_WARNINGS 1
// 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 the information of the designated person 
//4.  Modify the information of the designated person 
//5.  Find the information of the designated person 
//6.  Sort the information of the address book 

#include"contact.h"
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");
}
enum Option
{
    
	EXIT,
	ADD,
	DEL,
	SEARCH,
	MODIFY,
	SORT,
	PRINT
};
int main()
{
    
	int input = 0;
	// Create address book con
	Contact con;
	// Initialize address book 
	InitContact(&con);

	do
	{
    
		menu();
		printf(" Please select ：>");
		scanf("%d", &input);
		switch (input)
		{
    
		          case ADD:
				         AddContact(&con);// Add new personal information 
				         break;
				   case DEL:
					     DelContact(&con);// Delete Contact 
					     break;
				   case SEARCH:
					     SearchContact(&con);// Find contacts 
					      break;
				   case MODIFY:
					      ModifyContact(&con);// Modify contact information 
					      break;
				   case SORT:
					   SortContact(&con);// Contacts are sorted by name 
					   break;
				   case PRINT:
					      PrintContact(&con); // Show contact information 
					   break;
				   case EXIT:
					   printf(" Exit address book ");
					   break;
		}
	} while (input);
	return 0;
}

Summary of key points and difficulties ：

One ：
Define a personal information structure , Its member variable is personal name , Gender and other information
Define an address book structure , Its members are an array of personal information structures （ Store the information of multiple contacts ） And number of contacts （ It is convenient to add, delete and modify the address book ）

Two ：
Function reuse simplifies code . For example, modify contact information , To find a contact, you need to compare the entered name with the name stored in the address book through a cycle , Determine whether there is this contact , If you have any , Return to the storage location .

3、 ... and ：
The implementation idea of deleting contacts ：
Overwrite the contact information to be deleted with the next contact information , The contact information in the back will be overwritten forward in turn , At last, the number of contacts is reduced by one . If the contact information to be deleted is stored in the last position of the array, the program will not enter the loop （i In the beginning, it is equal to sz-1）, Directly reduce the number of contacts by one to delete the contact .

Four ：
Format control during printing ： The following figure realizes left alignment , Realize right alignment and remove % The minus sign after .