C program to sort a customer list in the alphabetical list

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

#define CUSTOMERS 10

void main()
{
    char first_name[20][10], second_name[20][10], surname[20][10], name[20][20], telephone[20][10], dummy[20];

    int i,j;

    printf("Input names and telephone numbers");
    printf("?");

    for(i=0;i<CUSTOMERS;i++)
    {
        scanf("%s %s %s %s", first_name[i],second_name, surname[i], telephone[i]);

        strcpy(name[i], surname[i]);
        strcat(name[i], ",");

        dummy[0]=first_name[i][0];
        dummy[1]='';

        strcat(name[i],dummy);
        stcat(name[i],".");

        dummy[0]=second_name[i][0];
        dummy[1]='';

        strcat(name[i],dummy);
    }

    for(i=1;i<=CUSTOMERS-1;i++)
    for(j=1;j<=CUSTOMERS-1;j++)
        if(strcmp(name[j-1], name[j])>0)
        {
            strcpy(dummy,name[j-1]);
            strcpy(name[j-1],name[j]);
            strcpy(name[j],dummy);
            strcpy(dummy,telephone[j-1]);
            strcpy(telephone[j-1],telephone[j]);
            strcpy(telephone[j],dummy);
        }

        printf("CUSTOMERS LIST IN ALPHABETICAL ORDER");

        for(i=0;i<CUSTOMERS;i++)
            printf("%-20st%-10s",name[i],telephone[i]);
}

 
Input names and telephone numbers
? anandamurugan 9486153102
Renukadevi 9486644542

CUSTOMERS LIST IN ALPHABETICAL ORDER

anandamurugan 9486153102
Renukadevi 9486644542