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programming with c language (5)

/* a billing system - to demonstrate use of structures
 
 program which allows the user to enter the customer records
 and also computes the value of the new balance (based upon the
 payment made by the customer and the old balance).
*/
#include<stdio.h>
#include<string.h>
#include<time.h>
/* definitions of structures */
struct date{
 int mm;
 int dd;
 int yy;
};
struct person{
 char name[80];
 struct date purchaseDate;
 float amount;
 struct date paymentDate;
} cust[100];
/* declaration of functions */
initialize();
enterRec();
viewRec();
paymentRec();

/* global variables */
int maxRecord=0;
time_t ltime;
char buf[128];
/* unix time
 time(&ltime);
 printf("%s",ctime(&ltime));
*/
main(){
 char option;
 initialize();
 _strdate(buf); /* _strtime(buf) will display the local time */
 do{
  printf("\tMainmenu \n\t%s\n",buf);
  printf("1. Make payment\n");
  printf("2. Enter Purchase\n");
  printf("3. View Record\n");
  printf("q. Quit\n");
  option=getchar();
  fflush(stdin);
  switch(option){
  case '1': printf("\tMAKE PAYMENT\n");
   paymentRec();
   break;
  case '2': printf("\tENTER PURCHASE DETAILS\n");
   enterRec();
   break;
  case '3': printf("\tVIEW RECORDS\n");
   viewRec();
   break;
  case 'Q': option='q';
   break;
  }
 }while(option!='q');
}

initialize(){
 int i;
 for(i=0;i<100;i++){
  cust[i].name[0]=' ';
  cust[i].purchaseDate.dd=0;
  cust[i].purchaseDate.mm=0;
  cust[i].purchaseDate.yy=0;
  cust[i].amount=0.0;
  cust[i].paymentDate.dd=0;
  cust[i].paymentDate.mm=0;
  cust[i].paymentDate.yy=0;
 }
}

enterRec(){
 char arrName[80];
 char confirmYN;
 int day,month,year, i=maxRecord;
 float amt;
 printf("Please enter account Name:");
 gets(arrName);
 fflush(stdin);
 printf("Enter Purchase date(dd/mm/yy):");
 scanf("%d/%d/%d",&day,&month,&year);
 fflush(stdin);
 printf("Enter Purchase Amount:");
 scanf("%f",&amt);
 fflush(stdin);
 printf("Press 'y' to confirm entry:");
 if((confirmYN=getchar()) != 'y'){
  printf("Records not updated!\n");
 }
 else{
  strcpy(cust[i].name,arrName);
  cust[i].purchaseDate.dd=day;
  cust[i].purchaseDate.mm=month;
  cust[i].purchaseDate.yy=year;
  cust[i].amount=amt;
  maxRecord++;
 }
 fflush(stdin);
 return 0;
}

viewRec(){
 char arrName[80];
 int i=0;
 printf("Enter name to view:");
 gets(arrName);
 fflush(stdin);
 while(i<=maxRecord){
  if(! strcmp(cust[i].name,arrName)){
   printf("Name:%s\n",cust[i].name);
   printf("Purchase date:%d/%d/%d\tPurchase balance:%f\n",\
    cust[i].purchaseDate.dd,\
    cust[i].purchaseDate.mm,\
    cust[i].purchaseDate.yy,\
    cust[i].amount);
   if(cust[i].paymentDate.dd==0)
    printf("No Payments made!\n");
   else
    printf("Last payment on:%d/%d/%d\n", \
     cust[i].paymentDate.dd,\
     cust[i].paymentDate.mm,\
     cust[i].paymentDate.yy);
  }
  i++;
 }
}

paymentRec(){
 char arrName[80];
 int i=0, found=0;
 float amt=0.0;
 printf("Enter name to make payment:");
 gets(arrName);
 fflush(stdin);
 while(i<=maxRecord){
  if(! strcmp(cust[i].name,arrName)){
   printf("Name:%s\n",cust[i].name);
   printf("Purchase date:%d/%d/%d\tPurchase balance:%f\n",\
    cust[i].purchaseDate.dd, \
    cust[i].purchaseDate.mm, \
    cust[i].purchaseDate.yy, \
    cust[i].amount);
   if(cust[i].amount<=0)
    printf("Zero Balance!\n");
   else{
    printf("Enter payment amount:");
    scanf("%f",&amt);
    fflush(stdin);
    printf("Payment made on (dd/mm/yy):");
    scanf("%d/%d/%d", \
     &cust[i].paymentDate.dd, \
     &cust[i].paymentDate.mm, \
     &cust[i].paymentDate.yy);
    fflush(stdin);
    cust[i].amount-=amt; /* validation may be required */
    found=1;
   }
  }
  i++;
 }
 if(found==0)
  printf("No such name found!\n");
 return 0;
}

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