#include<stdio.h>

struct student

{

int number;

char name, surname[30];

}stud;

// FUNCTION TO INSERT RECORDS TO PHONEBOOK

void insert()

{

FILE *fp;

fp = fopen("Record", "a";

printf("Enter Number :";

scanf("%d", &stud.number);

printf("Enter Name :";

scanf("%s", &stud.name);

printf("Enter Surname :";

scanf("%s", &stud.surname);


fwrite(&stud.number, sizeof(stud.number), 1, fp);
fwrite(&stud.name, sizeof(stud.name), 1, fp);
fwrite(&stud.surname, sizeof(stud.surname), 1, fp);


fclose(fp);

}

// FUNCTION TO DISPLAY RECORDS

void disp()

{

FILE *fp1;

fp1 = fopen("Record", "r";

printf("\nNumber\tName\tSurname\n\n";

while (fread(&stud.number, sizeof(stud.number), 1, fp1)
printf(" %d\t\t", stud.number);
(fread(&stud.name, sizeof(stud.name), 1, fp1)
printf(" %s\t", stud.name, stud.surname);
(fread(&stud.surname, sizeof(stud.surname), 1, fp1
printf(" %s\n", stud.surname);

fclose(fp1);

}

// FUNCTION TO SEARCH THE GIVEN RECORD

void search()

{

FILE *fp2;

int r, s, avl;

printf("\nEnter the Number you want to search :";

scanf("%d", &r);

avl = avlnumber(r);

if (avl == 0)

printf("Number %d is not available in the file\n",r);

else

{

fp2 = fopen("Record", "r";

while (fread(&stud, sizeof(stud), 1, fp2))

{

s = stud.number;

if (s == r)

{

printf("\nMobile no = %d", stud.number);

printf("\nName = %s", stud.name);

printf("\nSurname = %s\n", stud.surname);

}



}

fclose(fp2);

}

}

// FUNCTION TO DELETE A RECORD

void deletefile()

{

FILE *fpo;

FILE *fpt;

int r, s;

printf("Enter the Phone number you want to delete :";

scanf("%d", &r);

if (avlnumber(r) == 0)

printf("Phone number %d is not available in the file\n", r);

else

{

fpo = fopen("Record", "r";

fpt = fopen("TempFile", "w";

while (fread(&stud, sizeof(stud), 1, fpo))

{

s = stud.number;

if (s != r)

fwrite(&stud, sizeof(stud), 1, fpt);

}

fclose(fpo);

fclose(fpt);

fpo = fopen("Record", "w";

fpt = fopen("TempFile", "r";

while (fread(&stud, sizeof(stud), 1, fpt))

fwrite(&stud, sizeof(stud), 1, fpo);

printf("\nRECORD DELETED\n";

fclose(fpo);

fclose(fpt);

}

}

// FUNCTION TO UPDATE THE RECORD

void update()

{

int avl;

FILE *fpt;

FILE *fpo;

int s, r, ch;

printf("Enter Phone number to update:";

scanf("%d", &r);

avl = avlnumber(r);

if (avl == 0)

{

printf("phone number %d is not Available in the file", r);

}

else

{

fpo = fopen("Record", "r";

fpt = fopen("TempFile", "w";

while (fread(&stud, sizeof(stud), 1, fpo))

{

s = stud.number;

if (s != r)

fwrite(&stud, sizeof(stud), 1, fpt);

else

{

printf("\n\t1. Update Phone Number %d", r);

printf("\n\t2. Update Name %s", r);

printf("\n\t3. Update Surname %s", r);

printf("\nEnter your choice:";

scanf("%d", &ch);

switch (ch)

{

case 1:

printf("Enter Number:";

scanf("%d", &stud.number);

break;

case 2:

printf("Enter Name : ";

scanf("%s", &stud.name);

break;

case 3:

printf("Enter Surname: ";

scanf("%s", &stud.surname);

break;

default:

printf("Invalid Selection";

break;

}

fwrite(&stud, sizeof(stud), 1, fpt);

}

}

fclose(fpo);

fclose(fpt);

fpo = fopen("Record", "w";

fpt = fopen("TempFile", "r";

while (fread(&stud, sizeof(stud), 1, fpt))

{

fwrite(&stud, sizeof(stud), 1, fpo);

}

fclose(fpo);

fclose(fpt);

printf("RECORD UPDATED";

}

}

/* FUNCTION TO SORT THE RECORD */

void sort()

{

int a[20], count = 0, i, j, t, c;

FILE *fpo;

fpo = fopen("Record", "r";

while (fread(&stud, sizeof(stud), 1, fpo))

{

a[count] = stud.number;

count++;

}

c = count;

for (i = 0; i<count - 1; i++)

{

for (j = i + 1; j<count; j++)

{

if (a[i]>a[j])

{

t = a[i];

a[i] = a[j];

a[j] = t;

}

}

}

printf("Phone No.\tName\t\tSurname\n\n";

count = c;

for (i = 0; i<count; i++)

{

rewind(fpo);

while (fread(&stud, sizeof(stud), 1, fpo))

{

if (a[i] == stud.number)

printf("\n %d\t\t %s \t\t %s",stud.number, stud.name, stud.surname);

}

}

}

// FUNCTION TO CHECK GIVEN ROLL NO IS AVAILABLE //

int avlnumber(int rno)

{

FILE *fp;

int c = 0;

fp = fopen("Record", "r";

while (!feof(fp))

{

fread(&stud, sizeof(stud), 1, fp);

if (rno == stud.number)

{

fclose(fp);

return 1;

}

}

fclose(fp);

return 0;

}

//FUNCTION TO CHECK THE FILE IS EMPTY OR NOT

int empty()

{

int c = 0;

FILE *fp;

fp = fopen("Record", "r";

while (fread(&stud, sizeof(stud), 1, fp))

c = 1;

fclose(fp);

return c;

}

// MAIN PROGRAM

void main()

{

int c, emp;

do

{

printf("---------------DELIMITER---------------\n";

printf("\n\t1. Add new record to phone book\n\t2. Display Phonebook record\n\t3. Search phonebook";

printf("\n\t4. Delete Contact\n\t5. Update Phonebook\n\t6. Sort phonebook";

printf("\n\t7. EXIT";

printf("\n\---------------DELIMITER---------------\n";

printf("\nChoose your Operation:";

scanf("%d", &c);

printf("\n";

switch (c)

{

case 1:

insert();

break;

case 2:

emp = empty();

if (emp == 0)

printf("\nThe file is EMPTY\n";

else

disp();

break;

case 3:

search();

break;

case 4:

deletefile();

break;

case 5:

update();

break;

case 6:

emp = empty();

if (emp == 0)

printf("\n The file is EMPTY\n";

else

sort();

break;

case 7:

exit(1);

break;

default:

printf("\nYour choice is wrong\nPlease try again...\n";

break;

}

} while (c != 7);

Guy you for just learn c++

first your code formatting is bad.

some of the functions you invoke requires stdlib.h and other header files you have not included

some of your function definition requires function prototype declaration.

i think you should follow the advice of the guy above me. C# is not a bad idea either as both of them initializes the environment for you.

but if you still want to stick out with C then get a C manual and join stackoverflow

cc stack1