Character Arrays and Strings

Processing of a Customer List

#include <stdio.h>
#define CUSTOMERS 10
void main()
{
char first_name[20][20],second_name[20][10],
     surname[20][10], name[20][20],telephone[20][10],dummy[20];
int i,j;
printf("Input names and telephone numbers\n");
printf("?");
for(i=0;i<CUSTOMERS;i++)
{
scanf("%s %s %s %s",first_name[i],second_name[i],surname[i],telephone[i]);
strcpy(name[i],surname[i]);
strcat(name[i],",");
dummy[0]=first_name[i][0];
dummy[1]='\0';
strcat(name[i],dummy);
strcat(name[i],".");
dummy[0]=second_name[i][0];
dummy[1]='\0';
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("\nCUSTOMERS LIST IN ALPHABETICAL ORDER \n\n");
for(i=0;i<CUSTOMERS;i++)
printf(" %-20s\t %-10s\n",name[i],telephone[i]);
getch();
}