# contains "string.h"

# contains "conio.h"

# contains "stdio.h"

# contains "dos.h"

FILE * fp

int I； //i is a global variable, not a length.

Structural address

{ char postnum[ 10]；

char a[40]； //Home address

};

Structural birthday

{int year;

Int month;

Int day;

};

Structural friends

{int num// serial number

char name[20]；

Charming sex;

Toll phone [13];

Structural birthday birthday;

Structure address address;

}

Friends [50];

Invalid load ()

{

int j；

Long k;

fp=fopen("friend.txt "，" a+")； //Open the file friend.txt

if(fp！ = empty)

{

for(I = 1； I & lt50; i++)

{

j = fgetc(FP)；

If(j==EOF) // Judge whether the end of the file has been reached.

Return;

k = I- 1；

fseek(fp，k*sizeof(struct ffriend)，SEEK _ SET)；

Fred (& friends [i], sizeof(struct ffriend), 1, fp); //Read the record from the file

}

}

other

{

fp=fopen("friend.txt "，" w ")；

I = 1；

}

}

Empty display (int j)

{

//friends [j]. num = I；

Printf ("\ n \ n \ tNo .. -n number: %3d ",friend [j]. num)；

Printf ("\ n \ tname -Name:%-20s "，friends[j]。 Name);

Printf ("\ n \ tGender -Sex:%c "，friends[j]。 Sex);

Printf(" \ n \ tTel- Tel: %- 13s ",friend [j]. Telephone);

Printf ("\ n \ tDate of birth-date of birth:% 4d-%2d-%3d", friends [j]. birthday Year, friend [j]. Birthday, month, friends. Birthday);

printf(" \ n \ tZip code-postnum:%- 10s "，friends [j]。 address . postnum)；

Printf(" \ n \ t E-mail address-address: %-40s ",friends [j]. address . a)；

}

Void addition (int j)

{

fflush(stdin)； //Clear the file buffer in this area, and write the buffer to the file when the file is opened in write mode.

//stdin is a standard file * (file pointer), which usually points to the input stream with a keyboard.

Friend [j]. num = j；

Printf(" \ n \ t \ t \ t tSerial number-number: %d ",j);

printf(" \ n \ t \ t \ tname-Name:")；

Scanf("%s ",friend [j]. Name);

fflush(stdin)； //Why is there no fflush (stdin); Will the effect automatically skip?

printf(" \ t \ t \ t gender-Sex(m/w):")； //Why do men and women who enter Chinese characters automatically skip the contact number?

Scanf("%c ",& Friend [j]. Sex);

printf(" \ t \ t \ t tel-Phone:")；

Scanf("%s ",friend [j]. Telephone);

Printf("\t Date of Birth-Birthday ");

Printf(" \ n \ t \ t \ t Year: ");

Scanf("%d ",& Friend [j]. Birthday. Year);

printf(" \ t \ t \ t month-month:")；

Scanf("%d ",& Friend [j]. Birthday. Month);

printf(" \ t \ t \-day:")；

Scanf("%d ",& Friend [j]. Birthday);

Printf ("\ t \ t \ tPostal Code-Postal Code: ");

scanf("%s "，friends[j]. address . postnum)；

Printf(" \ t \ t \ t Email address-address: ");

scanf("%s "，friends[j]. address . a)；

getchar()；

}

Void delete ()

{

int k；

Printf ("\ n \ tDelete serial number-serial number:");

scanf("%d "，& ampk)；

if(k & lt； =i)

{

for(int j = k； j & ltI+ 1； J++) /* Element order with backward insertion position */

{

Strcpy (friend [j]. Name, friend [j+ 1]. Name); /* Exchange element content */

Friend [j]. Sex = friends [j+ 1]. Sex;

Strcpy (friend [j]. Phone, friend [j+ 1]. Telephone);

Friend [j]. Birthday. Year = Friend [j+ 1]. Birthday. Year;

Friend [j]. Birthday. Month = Friend [j+ 1]. Birthday. Month;

Friend [j]. Birthday. Day = Friend [j+ 1]. Birthday. Day;

strcpy(friends[j]. address . postnum，friends[j+ 1]. address . postnum)；

Strcpy (friend [j].address.a, friend [j+1]. address.a);

}

I-；

}

other

{

Printf ("The serial number entered is too large!" );

}

}

void Modify(int j)

{

Add (j);

}

Invalid save ()

{

int j；

fp=fopen("friend.txt "，" w ")；

for(j = 1； j & lt= I； j++)

{

fwrite(& amp； friends[j]，sizeof(struct ffriend)， 1，FP)；

}

fclose(FP)；

}

void main()

{

int j；

Carbonization grade;

char search name[ 10]；

load()；

I-；

do

{

Printf ("\ t \ t \ t \ t \ tSimple Address Book \ n \ n");

Printf ("function selection \ n");

Printf (" 1A。 Read \ n ");

Printf("\2B。 append \ n ")；

Printf("\6C。 insert \ n ")；

Printf("\5D。 Delete \ n ");

Printf("\5E。 Search \ n ");

Printf("。 Modify \ n ");

Printf("\2G。 Save \ n ");

Printf (" 1h。 Exit \ n ");

Printf ("please choice") \ nNote: Enter capital letters of A~H \ n ");

Scanf("%c ",& grade);

Switch (grade)

//You can add uppercase and lowercase letters.

{

Case' a': j =1; //Display function

while(getchar()！ = 0x 1b & amp； & ampj & lt=i) // Add and press Esc to exit.

{

show(j++)；

Printf ("\ nPlease press Enter to continue!" );

}

If (j-1<; 1)

{

Printf ("\ n \ tEmpty undocumented document-empty comment \ n ");

Printf ("\ nPlease press Enter to continue!" );

getchar()；

}

Printf("\n\t\t\t\t\t\t This operation has ended ");

printf(" \ n \ t-\ t \ t \ n ")；

Break;

Case "b"://Add a function

While (I & lt=50) // Add the function of pressing ESC to exit.

{

i++；

Add (1);

Printf ("\ tContinue to increase? y/n”)；

//If you modify and add else, you will jump out or force a printing error.

char a = getchar()；

if(a=='n'||a=='N ')

Break;

}

if(i==5 1)

Printf ("\ n \ tThe document is full, so the record cannot be added-please note that it is full");

Printf("\n\t\t\t\t\t\t This operation has ended ");

printf(" \ n \ t-\ t \ t \ n ")；

getchar()；

Break;

Case "c":

int k；

Printf ("\ n \ tEnter the location to insert:");

scanf("%d "，& ampk)；

j = I+ 1；

Friend [j]. num = j；

for(j； j & gtk； J-)// Insert function

{

Strcpy (friend [j]. Name, friend [j- 1]. Name); //Data moves backwards

Friend [j]. Sex = friends [j- 1]. Sex;

Strcpy (friend [j]. Telephone, friend [j- 1]. Telephone);

Friend [j]. Birthday. Year = Friend [j- 1]. Birthday. Year;

Friend [j]. Birthday. Month = Friend [j- 1]. Birthday. Month;

Friend [j]. Birthday. Day = Friend [j- 1]. Birthday. Day;

strcpy(friends[j]. address . postnum，friends[j- 1]. address . postnum)；

Strcpy (friend [j].address.a, friend [j-1]. address.a);

}

Add (k);

i++；

Printf("\n\t\t\t\t\t\t This operation has ended ");

printf(" \ n \ t-\ t \ t \ n ")；

Break;

Case' d'://Delete function//Add the function of deleting multiple records at will.

delete()；

If (I< 1)

Printf ("\ nNo record-No record \ n");

Printf ("\ nPlease press Enter to continue!" );

getchar()；

getchar()；

Printf("\n\t\t\t\t\t\t This operation has ended ");

printf(" \ n \ t-\ t \ t \ n ")；

Break;

Case "e"://Query function

Printf ("\ n \ tPlease enter the relevant name of the record to be queried:"); //Add query by column number

scanf("%s "，search name)；

for(j = 1； j & lt= I； j++)

{

If (strcmp (searchname, friends [j].name)= = 0)// Compare strings.

{

Display (j);

Break;

}

}

If (I< 1)

{

Printf ("\ nThere is no record you are looking for-no record");

Printf ("\ nPlease press Enter to continue!" );

getchar()；

}

Printf("\n\t\t\t\t\t\t This operation has ended ");

printf(" \ n \ t-\ t \ t \ n ")；

getchar()；

Break;

Case "f"://Modify function//Add query by serial number.

Printf ("\ n \ tPlease enter the related name of the record to be modified:");

Get (search name);

scanf("%s "，search name)；

for(j = 1； j & lt= I； j++)

{

If (strcmp (searchname, friends [j].name)= = 0)// Compare strings.

{

Modify (j);

//getchar()； //Add output confirmation modification?

}

}

If (I <1)//modify the function,

{printf ("\ nNo record to modify-no record");

Printf ("\ nPlease press Enter to continue!" );

getchar()；

getchar()；

}

Printf("\n\t\t\t\t\t\t This operation has ended ");

printf(" \ n \ t-\ t \ t \ n ")；

Break;

Case "g":

save()； //Save function

getchar()；

Printf("\n\t\t\t\t\t\t This operation has ended ");

printf(" \ n \ t-\ t \ t \ n ")；

Break;

Case "H"://Exit function

char x；

Printf ("Do you want to save it? Yes/No \ n ");

scanf("%s "，& ampx)；

//getchar()；

//getchar()；

if(x=='y ')

{

save()；

Exit (0);

}

other

Exit (0);

Default value:

Printf ("\ n \ tWrong input, please enter the correct serial number!" );

Printf ("\ nPlease press Enter to continue!" );

getchar()；

Printf("\n\t\t\t\t\t\t This operation has ended ");

printf(" \ n \ t-\ t \ t \ n ")；

}

} while( 1)；

}