Functions of address book

Menu display

void print()
{
    
	printf("****************************************\n");
	printf("*****1. Add contacts  2. Delete Contact *****\n");
	printf("*****3. Find contacts  4. Information changes  *****\n");
	printf("*****5. display information  6. Clear address book *****\n");
	printf("*****7. Sort  0. sign out *****\n");
	printf("****************************************\n");
}

Add contacts

void add(contact* con)
{
    
	assert(con);
	if (con->count > 1000)
	{
    
		printf(" The address book is full ！\n");
		return;
	}
	printf(" Please enter the contact name :>\n");
	scanf("%s", con->data[con->count].name);
	printf(" Please enter the gender of the contact person :>\n");
	scanf("%s", con->data[con->count].sex);
	printf(" Please enter the contact age :>\n");
	scanf("%d", &(con->data[con->count].age));
	printf(" Please enter the contact number :>\n");
	scanf("%s", con->data[con->count].tele);
	printf(" Please enter contact address :>\n");
	scanf("%s", con->data[con->count].addr);
	con->count++;
}

To add a contact here is to enter the contact information , At the same time, let the counting times of the structure +1.

Delete Contact

void del(contact* con)
{
    
	char name[20] = {
     0 };
	printf(" Please enter the name of the contact you want to delete :>\n");
	scanf("%s", name);
	int s = search(con,name);
	int i = 0;
	for (i = s; i < con->count - 1; i++)
	{
    
		con->data[i] = con->data[i + 1];
	}
	con->count--;
	printf(" Delete successful ！\n");
}

Deleting contacts is simple , I delete contacts here by looking up contacts , If you write it yourself , It can be done by phone number or other methods

Find contacts

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

The function of finding contacts is very simple , Is to enter the name , Then compare the entered name with the name of the existing contact

Information changes

// Menu options 
void menu1()
{
    
	printf("*************************************\n");
	printf("*********1. full name  2. Gender *********\n");
	printf("*********3. Age  4. Phone number *****\n");
	printf("*********5. Address  0. No modification *****\n");
	printf("*************************************\n");
}
// Modify contact information 
void modify(contact* con)
{
    
	char name[max_name] = {
     0 };
	int choice = 0;
	printf(" Please enter the contact name to modify :>\n");
	scanf("%s", name);
	int s = search(con, name);
	if (s != -1)
	{
    
		do
		{
    
			printf(" Please modify the contact information according to your needs !\n");
			menu1();
			printf(" Please enter the options of the contact information you want to modify :>\n");
			scanf("%d", &choice);
			switch (choice)
			{
    
			case 1:
				printf(" Please modify the contact name :>\n");
				scanf("%s", con->data[s].name);
				break;
			case 2:
				printf(" Please modify the contact gender :>\n");
				scanf("%s", con->data[s].sex);
				break;
			case 3:
				printf(" Please modify the age of the contact :>\n");
				scanf("%d", &(con->data[s].age));
				break;
			case 4:
				printf(" Please modify the contact phone number :>\n");
				scanf("%s", con->data[s].tele);
				break;
			case 5:
				printf(" Please modify the contact address :>\n");
				scanf("%s", con->data[s].addr);
				break;
			default:
				printf(" There is no such option , Please reselect :>\n");
				break;
			}
		} while (choice);
	}
	else
	{
    
		printf(" The contact information you want to modify does not exist ！\n");
		return ;
	}
}

Also by calling the lookup function , Then modify the contact information according to your own needs

Show contact information

void show(contact* con)
{
    
	int i = 0;
	printf("%-10s%-5s%-6s%-15s%-20s\n", " full name ", " Gender ", " Age ", " Phone number ", " Address ");
	for (i = 0; i < con->count; i++)
	{
    
		printf("%-10s%-5s%-6d%-15s%-20s\n", con->data[i].name,
										con->data[i].sex,
										con->data[i].age,
										con->data[i].tele,
										con->data[i].addr);
	}
}

Traverse the contact data in this structure , Then print them one by one

Clear address book

// Clear address book 
void clear(contact* con)
{
    
	con->count = 0;
	printf(" Clear successfully ！\n");
}

This function is the simplest , Let the number of contacts become 0, Unable to read address book information .

Sort address book

// Comparison function 
int cmp(void* e1, void* e2)
{
    
	return (strcmp(((info*)e1)->name ,((info*)e2)->name));
}

// Exchange function 
void Swap(char* e1, char* e2, int size)
{
    
	int i = 0;
	for (i = 0; i < size; i++)
	{
    
		char tmp = *e1;
		*e1 = *e2;
		*e2 = tmp;
		e1++;
		e2++;
	}
}

// Sort function based on bubble sort idea 
void bubble_sort(void* base,
	size_t num,
	size_t size,
	int(*cmp)(void* e1, void* e2))
{
    
	int i = 0;
	int j = 0;
	for (i = 0; i < num - 1; i++)
	{
    
		for (j = 0; j < num - 1 - i; j++)
		{
    
			int sz = cmp(((char*)base + j * size), ((char*)base + (j + 1) * size));
			if (sz>0)
			{
    
				Swap(((char*)base + j * size), ((char*)base + (j + 1) * size), size);
			}
		}
	}
}
// Sort address book 
void sort(contact* con)
{
    
	bubble_sort(con->data,
				con->count,
				sizeof(info),
				cmp);
	printf(" Sort success ！\n");
}

Here I use the idea of bubble sorting to sort the address book , At the same time, my sorting function is applicable to all types of sorting , If readers are bothered, they can use library functions qsort Function to sort .

The main function

enum choe {
    
	EXIT,
	ADD,
	DELETE,
	SEARCH,
	MODIFY,
	SHOW,
	CLEAR,
	SORT
};
int main()
{
    	
	int input = 0;
	contact con;
	memset(&con, 0, sizeof(con));
	do 
	{
    
		print();
		printf(" Please select the function :>\n");
		scanf("%d", &input);
		switch (input)
		{
    
			case ADD:
				printf(" Please enter information :>\n");
				add(&con);
				break;
			case DELETE:
				del(&con);
				break;
			case SEARCH:
				printf(" Please enter the contact you want to find :>\n");
				char name[max_name] = {
     0 };
				inputname(name);
				int x = search(&con, name);
				if (x >= 0)
				{
    
					printf(" Find success ！\n");

				}
				else
				{
    
					printf(" Check no one !\n");
				}
				show1(&con, x);
				break;
			case MODIFY
				:
				modify(&con);
				break;
			case SHOW:
				show(&con);
				break;
			case CLEAR:
				clear(&con);
				break;
			case SORT:
				sort(&con);
				break;
			case EXIT:
				printf(" sign out \n");
				break;
		}
	} while (input);
	return 0;
}

Enumeration is used here , So that every function can see the name and know the meaning , clear .
There is no effect display here , This address book is relatively simple , You can copy it yourself , And then run , The compiler is vs2019, Thank you ！