hey guys, I have written this code for a phonebook, I wanted to know what to do, so that people can search for others by their phone number using linear search.
Code:/***********************************************************************
Description:This is an interactive menu driven program. It is designed
to implement an automated telephone book. Each entry in this automated
telephone book will contain a name and a telephone number.
***********************************************************************/
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define TEL_BOOK_SIZE 75
#define NAME_SIZE 22
#define TEL_NUM_SIZE 14
struct tel_book_element
{ char name[NAME_SIZE];
char tel_num[TEL_NUM_SIZE];
};
typedef struct tel_book_element Tel_Book_Element;
struct tel_book
{ Tel_Book_Element entry[TEL_BOOK_SIZE];
int n;
};
typedef struct tel_book Tel_Book;
int binarySearch(const Tel_Book *tbp, const char searchName[], int *ip);
void putTelBook(const char *fname,Tel_Book *tbp);
void getTelBook(const char *fname,Tel_Book *tbp);
void displayMenu(void);
char *strToUpper(char *s);
void lookUpName(Tel_Book *tbp);
void listName(Tel_Book *tbp);
void modify(Tel_Book *tbp);
void del(Tel_Book *tbp);
void inputNewBook(char *fname,Tel_Book *tbp);
void sortTelBook(Tel_Book *tbp);
int main()
{ Tel_Book tb;
char save,keyHit,fname[NAME_SIZE]="a:tbfile.txt";
getTelBook(fname,&tb);
do
{ displayMenu();
printf("Enter Your Selection (a-f) ");
keyHit=getchar();
getchar(); /* get rid of the new line character */
switch(keyHit)
{ case'a':case'A': lookUpName(&tb); break;
case'b':case'B': listName(&tb); break;
case'c':case'C': modify(&tb); break;
case'd':case'D': del(&tb); break;
case'e':case'E': inputNewBook(fname,&tb); break;
case'f':case'F':
printf("Do you want to save it (y/n)? "); save=getchar();
if(save=='y'||save=='Y')
putTelBook(fname,&tb);
break;
default:
printf("Option is not correct. Hit Enter to continue");
getchar();
break;
}
}while(keyHit!='f' && keyHit!='F');
return 0;
}
/***********************************************************************
The function inputNewBook close the current TelBook and read the new
TelBook from file, uppercase name, and sort in alphabetical order.
***********************************************************************/
void inputNewBook(char *fname,Tel_Book *tbp)
{ int m;
char save;
printf("Do you want to save the current one (y/n)? ");
save=getchar(); getchar();
if(save=='y'||save=='Y')
putTelBook(fname,tbp);
printf("Enter the filename: ");
gets(fname);
getTelBook(fname,tbp);
for(m=0;m<tbp->n;m++)
strToUpper(tbp->entry[m].name);
sortTelBook(tbp);
printf("New telephone book has been inputed.\n");
printf("Press Enter to continue"); /* pause the output */
getchar();
}
/***********************************************************************
The function sortTelBook sort all the name in alphabetical order.
***********************************************************************/
void sortTelBook(Tel_Book *tbp)
{ int pass,m;
char hold[NAME_SIZE];
for(pass=1;pass<tbp->n;pass++)
for(m=0;m<(tbp->n)-pass;m++)
if(strcmp(tbp->entry[m].name,tbp->entry[m+1].name)>0)
{ /* swap 2 elements */
strcpy(hold,tbp->entry[m].name);
strcpy(tbp->entry[m].name,tbp->entry[m+1].name);
strcpy(tbp->entry[m+1].name,hold);
strcpy(hold,tbp->entry[m].tel_num);
strcpy(tbp->entry[m].tel_num,tbp->entry[m+1].tel_num);
strcpy(tbp->entry[m+1].tel_num,hold);
}
}
/***********************************************************************
This function displays the options of the interactive-user program.
***********************************************************************/
void displayMenu(void)
{
printf("a) Look-up Name\n");
printf("b) List Names Starting With Given String\n");
printf("c) Insert New or Modified Entry\n");
printf("d) Delete Entry\n");
printf("e) Input New Telephone Book\n");
printf("f) Quit\n");
}
/***********************************************************************
This function changes a string to uppercase.
***********************************************************************/
char *strToUpper(char *s)
{ int i;
for(i=0;s[i]!='\0';i++)
s[i]=toupper(s[i]);
return s;
}
/***********************************************************************
This function search a name, return 1 if found, 0 if not found, and ip
is the position found or should be inserted.
***********************************************************************/
int binarySearch(const Tel_Book *tbp, const char searchName[], int *ip)
{ int low,high,middle;
low=0;high=tbp->n-1;
while(low<=high)
{ middle=(low+high)/2;
if(strcmp(searchName,tbp->entry[middle].name)==0)
{ *ip=middle;
return 1;
}
else if(strcmp(searchName,tbp->entry[middle].name)<0)
high=middle-1;
else
low=middle+1;
}
*ip=low;
return 0;
}
/***********************************************************************
This function read information from a file, and store it to a struct
typed TelBook.
***********************************************************************/
void getTelBook(const char *fname,Tel_Book *tbp)
{ FILE *fp;
int m=0;
if ((fp=fopen(fname, "r"))==NULL)
{ printf("File could not be opened to read\n");
exit(1); /* terminate the program */
}
while(fgets(tbp->entry[m].name,NAME_SIZE,fp)!=NULL)
/* read while not EOF */
fgets(tbp->entry[m++].tel_num,TEL_NUM_SIZE,fp);
tbp->n=m; /* store the total of entries */
fclose(fp);
}
/***********************************************************************
This function output information from a struct TelBook to a file.
***********************************************************************/
void putTelBook(const char *fname,Tel_Book *tbp)
{ int m;
FILE *fp;
if ((fp=fopen(fname, "w"))==NULL)
{ printf("File could not be opened to write\n"); exit(1);
}
for(m=0;m<tbp->n;m++)
{ fputs(tbp->entry[m].name,fp);
fputs(tbp->entry[m].tel_num,fp);
}
fclose(fp);
}
/***********************************************************************
This function provides an option that user can look up an entry of the
telephone book.
***********************************************************************/
void lookUpName(Tel_Book *tbp)
{ char searchName[NAME_SIZE];
int i;
printf("Enter a name you want you look up: ");
fgets(searchName,NAME_SIZE,stdin);
strToUpper(searchName);
if(binarySearch(tbp,searchName,&i))
{ printf("Name found:\n");
printf("%s",tbp->entry[i].name);
printf("%s",tbp->entry[i].tel_num);
}
else
printf("Name not Found\n");
printf("Press Enter to continue");
getchar();
}
/***********************************************************************
This function provides an option that user can list all the names which
begin with the first name inputted.
***********************************************************************/
void listName(Tel_Book *tbp)
{ char name[NAME_SIZE];
int i,found=0;
printf("Enter a name you want to list: ");
gets(name);
strToUpper(name);
for(i=0;i<tbp->n;i++)
if(tbp->entry[i].name==strstr(tbp->entry[i].name,name))
{ found=1;
printf("%s",tbp->entry[i].name);
printf("%s",tbp->entry[i].tel_num);
}
if (!found)
printf("Name not in the list\n");
printf("Press Enter to continue");
getchar();
}
/***********************************************************************
This function provides an option that user can input an entry, if found
then modify, if not found then insert as a new entry.
***********************************************************************/
void modify(Tel_Book *tbp)
{ int i,j;
char name[NAME_SIZE],tel[TEL_NUM_SIZE];
printf("Enter the name to modify or insert: ");
fgets(name,NAME_SIZE,stdin);
strToUpper(name);
printf("Enter the telephone number: ");
fgets(tel,TEL_NUM_SIZE,stdin);
if(binarySearch(tbp,name,&i)) /* found entry */
{ printf("Modified Entry Inserted\n");
strcpy(tbp->entry[i].name,name); /* i is position modified */
strcpy(tbp->entry[i].tel_num,tel);
}
else /* not found the entry, i is position inserted */
{
printf("New Entry Inserted\n");
/* moving entries up by one position*/
for(j=tbp->n;j>i;j--)
{ strcpy(tbp->entry[j].name,tbp->entry[j-1].name);
strcpy(tbp->entry[j].tel_num,tbp->entry[j-1].tel_num);
}
strcpy(tbp->entry[i].name,name);
strcpy(tbp->entry[i].tel_num,tel);
tbp->n++;
}
printf("Press Enter to continue");
getchar();
}
/***********************************************************************
This function provides an option that user can delete one entry.
***********************************************************************/
void del(Tel_Book *tbp)
{ int i,j;
char name[NAME_SIZE];
printf("Enter the name to delete: ");
fgets(name,NAME_SIZE,stdin);
strToUpper(name);
if(binarySearch(tbp,name,&i))
{ printf("Entry Deleted\n");
for(j=i;j<tbp->n-1;j++) /* moving entries down by one position*/
{ strcpy(tbp->entry[j].name,tbp->entry[j+1].name);
strcpy(tbp->entry[j].tel_num,tbp->entry[j+1].tel_num);
}
tbp->n--;
}
else
printf("Name not Found\n");
printf("Press Enter to continue");
getchar();
}
