I'm revising a small program, I have successfully made this small program into a larger one, but I still need two functions.
- have an EDIT option
- return multiple records upon searching.
I am so done in C 4 years ago, I'm just helping a friend of mine.
Code:#include <stdio.h> #define CAPACITY 100 /* User commands */ #define ADD 'a' #define FIND 'f' #define LIST 'l' #define QUIT 'q' #define NAME_LEN 80 #define NUMBER_LEN 40 /* In memory representation of an entry in the phonebook. */ typedef struct { char name[ NAME_LEN ]; char number[ NUMBER_LEN ]; } phone_record; /* Procedures in phonebook.c */ char get_command( void ); phone_record *get_record( void ); void add_record( phone_record *new_record ); void list_phonebook( void ); int find_name( char *name ); int num_entries; // Number of entries currently in the phone book phone_record **phonebook; // Where the names are stored int main( int argc, char **argv ) { char ch; char name[ NAME_LEN ]; char confirm[ 10 ]; phone_record *rec; int loc; // Create an empty phonebook phonebook = (phone_record **)malloc( sizeof( phone_record *) * CAPACITY ); num_entries = 0; // Read commands until the user gets tired while ( ( ch = get_command() ) != QUIT ) { switch( ch ) { case ADD: // Get new info rec = get_record(); add_record( rec ); break; case FIND: // Name to find printf( "Name: " ); scanf( "%s", name ); // Look for the name if ( ( loc = find_name( name ) ) != -1 ) { printf( "Number: %s\n", phonebook[ loc ]->number ); } else { printf( "That name is not in the phonebook\n" ); } break; case LIST: // List the phonebook list_phonebook(); break; } } } /* * Read and return a command from the keyboard. */ char get_command() { char line[ 80 ]; do { // Get input printf( "pb> " ); // scanf returns -1 when it encoutners EOF - pretend we saw quit if ( scanf( "%s", line ) == -1 ) { line[ 0 ] = QUIT; printf( "\n" ); // Add new line so terminal looks nice } // Verify input (lightly) switch( line[ 0 ] ) { case ADD: case FIND: case LIST: case QUIT: break; default: printf( "Unrecognized command\n" ); line[ 0 ] = 0; } } while ( line[ 0 ] == 0 ); return line[ 0 ]; } /* * Add a new record to the phonebook. */ void add_record( phone_record *new_record ) { int cur; // Make sure there is room if ( num_entries == CAPACITY ) { printf( "Sorry phonebook is full\n" ); } else { // Insertion sort. Start at bottom and copy elements down one until // you find the first one less than what we are adding or we hit the // top of the phonebook for ( cur = num_entries; cur > 0 && strcmp( phonebook[ cur - 1 ]->name, new_record->name ) > 0; cur = cur - 1 ) { phonebook[ cur ] = phonebook[ cur - 1 ]; } // Add the entry in the open slot phonebook[ cur ] = new_record; num_entries = num_entries + 1; } } /* * List the entries in the phonebook. */ void list_phonebook() { int i; if ( num_entries != 0 ) { printf( "Name\t\tNumber\n" ); printf( "----\t\t------\n" ); for ( i = 0; i < num_entries; i = i + 1 ) { printf( "%s\t\t%s\n", phonebook[ i ]->name, phonebook[ i ]->number ); } } else { printf( "There are no entries in the phonebook\n" ); } } /* * Find a name in the phonebook. -1 means it is not there. */ int find_name( char *name ) { int pos = -1; int i; for ( i = 0; pos == -1 && i < num_entries; i = i + 1 ) { if ( strcmp( name, phonebook[ i ]->name ) == 0 ) pos = i; } return pos; } /* * Read and return a phone record from the keyboard. */ phone_record *get_record() { phone_record *rec; char *name; char *number; // Allocate storage for the phone record. Since we want the record // to live after the function returns we need to use malloc rec = (phone_record *)malloc( sizeof( phone_record ) ); // Get the data printf( "Name: " ); scanf( "%s", rec->name ); printf( "Phone: " ); scanf( "%s", rec->number ); return rec; }
you might want to run to compile and run it.
in the function:
it only returns 1 integer to this case:Code:int find_name( char *name ) { int pos = -1; int i; for ( i = 0; pos == -1 && i < num_entries; i = i + 1 ) { if ( strcmp( name, phonebook[ i ]->name ) == 0 ) pos = i; } return pos; }
Code:ifCode:( ( loc = find_name( name ) ) != -1 ) { printf( "Number: %s\n", phonebook[ loc ]->number ); }
Please help. I'm thinking that the method find_name should return an array instead, but I don't know how to implement that. Thanks
Originally Posted by Matticus
I only need to list down all the details using that find_name and lastly, add an EDIT function, I believe this is much easier.
sorry sorry. that would be the last time. I prefer using this forum, really. I usually use the other forum for my php learnings. People there are sometimes cold, you know.
but of course with something as an exchange :P I'm currently working in an IT company, therefore I'm already a college graduate, no need to worry about spoonfeeding hehe. Really I'm done with C. I just use C in microcontrollers but I ain't no proficient in that either. 
