programming with c language (5)

/* 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;
}