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There was a small phonebook code challenge to build the shortest at LeetCoders. Here's a little of what i did for fun. Functions include add contact, remove contact, search contact and display contacts.

[code]
#include <stdio.h>

#define PHONEBOOK_SIZE 512
#define FLUSH fflush(stdin); // fpurge(stdin) for linux

typedef struct
{
char name[32 + 1];
char mobile[32 + 1];
}PHONEBOOK, *PPHONEBOOK;

void AddContact(PHONEBOOK *);
void RemoveContact(PHONEBOOK *);
void SearchContact(PHONEBOOK *);
void DisplayContact(PHONEBOOK *);

short selection;
short size;

int main(int argc, char **argv)
{
PHONEBOOK pb[PHONEBOOK_SIZE];

selection = 0;
size = 0;

for( ; ; )
{
printf("1 - Add contact\n"
"2 - Remove contact\n"
"3 - Search contact\n"
"4 - Display all contacts\n"
"0 - Exit\n\n"
"Select an option: ");

FLUSH;
scanf("%d", &selection);

switch(selection)
{
case 1:
AddContact(&pb);
break;
case 2:
RemoveContact(&pb);
break;
case 3:
SearchContact(&pb);
break;
case 4:
DisplayContact(&pb);
break;
case 0:
printf("Thanks for using...\n");
return 0;
default:
printf("Invalid option selected...\n");
break;
}

printf("\n");
}
return 0;
}

void AddContact(PHONEBOOK *pb)
{
for( ; ; )
{
printf("Enter name: ");
FLUSH;
scanf("%32[^\n]", pb[size].name);

printf("Enter mobile number: ");
FLUSH;
scanf("%32[^\n]", pb[size].mobile);

printf("Confirm (Y - yes | N - no | B - back): ");
FLUSH;
scanf("%c", &selection);

switch(selection)
{
case 'y':
case 'Y':
size++;
printf("Added contact...\n");
return;
case 'n':
case 'N':
memset(pb[size].name, 0, 32 + 1);
memset(pb[size].mobile, 0, 32 + 1);
break;
case 'b':
case 'B':
memset(pb[size].name, 0, 32 + 1);
memset(pb[size].mobile, 0, 32 + 1);
printf("No contact added...\n");
return;
default:
printf("Invalid option selected... default to N\n");
break;
}

printf("\n");
}
}

void RemoveContact(PHONEBOOK *pb)
{
char name[32 + 1];
int i, j;

for( ; ; )
{
printf("Enter name (BK - back): ");
FLUSH;
scanf("%32[^\n]", name);

if((name[0] == 'b' || name[0] == 'B') && (name[1] == 'k' || name[1] == 'K') && name[2] == '\0')
return;

for(i = 0 ; i < size ; i++)
{
if(strstr(strlwr(pb[i].name), strlwr(name)) != 0)
{
printf("ID : %d\n", i+1);
printf("Name : %s\n", pb[i].name);
printf("Mobile: %s\n", pb[i].mobile);
printf("\n");

printf("Remove contact (Y - yes | N - no | B - back):");
FLUSH;
scanf("%c", &selection);

switch(selection)
{
case 'y':
case 'Y':
printf("Removing contact: %s\n", pb[i].name);
for(j = i ; j < size ; j++)
{
strcpy(pb[j].name, pb[j+1].name);
strcpy(pb[j].mobile, pb[j+1].mobile);
}
memset(pb[size].name, 0, 32 + 1);
memset(pb[size].mobile, 0, 32 + 1);
size--;
i--;
printf("Contact removed...\n");
break;
case 'n':
case 'N':
break;
case 'b':
case 'B':
return;
default:
printf("Invalid option selected... default to N\n");
break;
}
}
}
printf("\n");
}
printf("\n");
}

void SearchContact(PHONEBOOK *pb)
{
char name[32 + 1];
int i;

for( ; ; )
{
printf("Enter name (BK - back): ");
FLUSH;
scanf("%32[^\n]", name);

if((name[0] == 'b' || name[0] == 'B') && (name[1] == 'k' || name[1] == 'K') && name[2] == '\0')
return;

for(i = 0 ; i < size ; i++)
{
if(strstr(strlwr(pb[i].name), strlwr(name)) != 0)
{
printf("ID : %d\n", i+1);
printf("Name : %s\n", pb[i].name);
printf("Mobile: %s\n", pb[i].mobile);
printf("\n");
}
}

printf("\n");
}
}

void DisplayContact(PHONEBOOK *pb)
{
int i;

for(i = 0 ; i < size ; i++)
{
printf("ID : %d\n", i+1);
printf("Name : %s\n", pb[i].name);
printf("Mobile: %s\n", pb[i].mobile);
printf("\n");
}
}
[/code]