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/* Write a program that uses an array of structures to hold contact information (first name, last name,
address, phone number and email) for your friends. The program should allow the user to enter as many
friends as the user wants. In this program do the following:
a. Create a function to add entries in the phone book.
b. Create a function to delete a specific entry (lookup based on the first name, assuming
every entry has unique names) from the phone book.
(Hint: Use Dynamic Memory Allocation to shrink the array after deletion.)
c. Create a function to print valid phone book entries. Do not display phone book entries
that are invalid or NULL (0). You can assume that all people have unique names.
d. Create a function to randomly select a friend from the phonebook for you to call. */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
//STRUCTURE FOR PHONE BOOK ENTRIES
typedef struct phone {
char fname[10];
char lname[10];
char addr[30];
char phonum[15];
char email[30];
}emp;
//INITIALIZING FUNCTIONS
void add(emp *, int);
void print(emp *, int);
void remove(emp *, int);
//MAIN FUNCTION
main()
{
int e; //amount of entries in phone book
int sel=0; // user input
emp emp1[20]={'\0'};
printf("How many entries do you want in your phone book?\n");
scanf("%d", &e);
fflush(stdin);
while(sel!=5)
{
printf("\n\nSelect what you want to do to the phone book:\n\n"); //shows user different options and allows user to enter input
printf("1: Add an entry\n");
printf("2: Delete an entry\n");
printf("3: Print all entries\n");
printf("4: Randomly select a friend to call\n");
printf("5: Exit program\n");
printf("\n Enter number: ");
scanf("%d", &sel);
switch(sel) //switch that executes proper function depending on user input
{
case 1:
add(emp1, e);
break;
case 2:
remove(emp1, e);
break;
case 3:
print(emp1, e);
break;
default:
sel=5;
printf("\nYou are leaving the program!\n\n");
}
}
system("PAUSE");
return 0;
}
//FUNCTION TO ADD ENTRY
void add(emp * emp1, int n)
{
char fname[10]; //declaring variables for this function
char lname[10];
char addr[30];
char phonumm[15];
char email[30];
int i = 0; //test for if element is filled later on in this functin. 0 means no and i means yes.
char t[3]={'\0'}; //established to allow strcmp to compare to a null value
printf("\n\nYou are entering a new phone book entry!\n\n"); //user assigning value to each variable
printf("Enter first name: ");
scanf("%s", &fname);
fflush(stdin);
printf("\nEnter last name: ");
scanf("%s", &lname);
fflush(stdin);
printf("\nEnter address: ");
scanf("%s", &addr);
fflush(stdin);
printf("\nEnter phone number: ");
scanf("%s", &phonumm);
fflush(stdin);
printf("\nEnter email: ");
scanf("%s", &email);
fflush(stdin);
for(int c = 0; i=0; c++) //goes through whole array
{
if(strcmp(emp1[c].fname, t)==0) //makes sure it enters data only if element is empty
{
strcpy(emp1[c].fname, fname); //copies user input into necessary part of structure array
strcpy(emp1[c].lname, lname);
strcpy(emp1[c].addr, addr);
strcpy(emp1[c].phonum, phonumm);
strcpy(emp1[c].email, email);
i = 1;
}
}
}
//FUNCTION THAT PRINTS OUT ADDRESSES IN FUNCTIONS
void print(emp * emp1, int n)
{
char t[3]={'\0'}; //established so it can be used to compare each element to 'null'
printf("\n\nYou are printing out your phonebook!");
for(int x=0; x < n; x++) //for loop to print out correct number of entries. goes through whole array.
{
if(strcmp(emp1[n].fname, t)!=0) //makes sure it skips over empty arrays
{
printf("\n\n Entry #%d", x+1);
printf("\n First Name: %s", emp1[x].fname);
printf("\n Last Name: %s", emp1[x].lname);
printf("\n Address: %s", emp1[x].addr);
printf("\n Phone Number: %s", emp1[x].phonum);
printf("\n E-mail: %s", emp1[x].email);
}
}
}
//FUNCTION THAT ALLOWS USER TO REMOVE AN ENTRY
void remove(emp * emp1, int n)
{
char out[10]; //initializes variables
char t[3]={'\0'};
int c;
printf("\n\nYou can now remove a name from the phonebook!"); //allows user to input name to remove
printf("\nEnter the first name of the entry you'd like to remove: ");
scanf("%s", &out);
fflush(stdin);
for(int x=0; x<n; x++) //for loop that goes through all the structures
{
if(strcmp(out, emp1[x].fname)==0) //frees up space if user input matches the array
{
free(emp1[x].fname);
free(emp1[x].lname);
free(emp1[x].addr);
free(emp1[x].phonum);
free(emp1[x].email);
}
}
for(c=0; c<20; c++); //for loop to shrink array
{
if(strcmp(emp1[n].fname, t)==0) //if element matches null, replaces element with the next function up
{
strcpy(emp1[c].fname, emp1[c+1].fname);
strcpy(emp1[c].addr, emp1[c+1].addr);
strcpy(emp1[c].phonum, emp1[c+1].phonum);
strcpy(emp1[c].email, emp1[c+1].email);
}
}
}
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