/* Structure - Mobile customers -Program to read the names of mobile customers through keyboard and sort them alphabetically on last name. Display the sorted list on monitor. */

#include   <stdio.h>
#include   <conio.h>
#include   <string.h>

void main()
{
    struct name
    {
        char fname[20] ;
        char lname[20] ;
    } ;
    struct  name  x[50], temp ;
    int  i, j, n ;
    clrscr() ;
    printf("Enter the number of mobile customers: ") ;
    scanf("%d", &n) ;
    printf("Enter names of mobile customers in the format: \n") ;
    printf("FIRST NAME   LAST NAME \n") ;
    for(i=0 ; i<n ; i++)
        scanf("%s %s", x[i].fname, x[i].lname) ;
    for(i=0 ; i<n-1 ; i++)
        for(j=0 ; j<n-1-i ; j++)
            if( strcmp(x[j].lname, x[j+1].lname) >0 )
                {
                    temp=x[j] ;
                    x[j]=x[j+1] ;
                    x[j+1]=temp ;
                }
    printf("\nList sorted alphabetically as per last name is as shown:\n") ;
    for(i=0; i<n; i++)
        printf("%s %s \n", x[i].fname, x[i].lname) ;
    getch() ;
}

/* In this program I have used strcmp() to compare two strings. strcmp() is case sensitive. A better option is to use strcmpi() which is not case sensitive. However, some compilers do not support strcmpi() */

/*
Output:

Enter the number of mobile customers: 3
Enter names of mobile customers in the format:
FIRST NAME   LAST NAME
Tarun  Kapoor
Sandeep  Gupta
Amit  Doshi

List sorted alphabetically as per last name is as shown:
Amit Doshi
Sandeep Gupta
Tarun Kapoor
*/