Customer Billing System In C
Introduction :-
Client Billing System Project is a basic control center application intended to exhibit the viable utilization of C programming language and its highlights as wells as to produce an application which can be utilized in any departmental store, shops, bistros and so forth for charging to the client.
You can utilize this application to keep the records like name, address, versatile number, paid sum, due sum, installment date and so on of your ordinary costumer. In addition, on the off chance that you have another client, you can add and alter the record whenever.
The source code of Customer Billing System Project in C has been written in C programming language without of the utilization of any illustrations. The code is finished, absolutely mistake free and not so long – just. It is to be aggregated in Code::Blocks utilizing GCC compiler.
Code :-
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void input();
void writefile();
void search();
void output();
struct date{
int month;
int day;
int year;
};
struct account {
int number;
char name[100];
int acct_no;
float mobile_no;
char street[100];
char city[100];
char acct_type;
float oldbalance;
float newbalance;
float payment;
struct date lastpayment;
}customer;
int tl,sl,ts;
void main()
{
int i,n;
char ch;
clrscr();
_setcursortype(_NOCURSOR);
printf(" CUSTOMER BILLING SYSTEM:\n\n");
printf("===============================\n");
printf("\n1: to add account on list\n");
printf("2: to search customer account\n");
printf("3: exit\n");
printf("\n================================\n");
do{
printf("\nselect what do you want to do?");
ch=getche();
}while(ch<='0' || ch>'3');
switch(ch){
case '1':
clrscr();
printf("\nhow many customer accounts?");
scanf("%d",&n);
for(i=0;i<n;i++){
input();
if(customer.payment>0)
customer.acct_type=(customer.payment<0.1*customer.oldbalance)? 'O': 'D';
else
customer.acct_type=(customer.oldbalance>0)?'D' : 'C';
customer.newbalance=customer.oldbalance - customer.payment;
writefile();
}
main();
case '2':
clrscr();
printf("search by what?\n");
printf("\n1 --- search by customer number\n");
printf("2 --- search by customer name\n");
search();
ch=getche();
main();
case '3':
clrscr();
delay(700);
textcolor(RED);
gotoxy(25,25);
cprintf("\nA PROJECT BY BIDUR & SUJAN");
delay(1500);
exit(1);
}
}
void input()
{
FILE *fp=fopen("bidur.dat","rb");
fseek (fp,0,SEEK_END);
tl=ftell(fp);
sl=sizeof(customer);
ts=tl/sl;
fseek(fp,(ts-1)*sl,SEEK_SET);
fread(&customer,sizeof(customer),1,fp);
printf("\ncustomer no:%d\n",++customer.number);
fclose(fp);
printf(" Account number:");
scanf("%d",&customer.acct_no);
printf("\n Name:");
scanf("%s",customer.name);
printf("\n mobile no:");
scanf("%f",&customer.mobile_no);
printf(" Street:");
scanf("%s",customer.street);
printf(" City:");
scanf("%s",customer.city);
printf(" Previous balance:");
scanf("%f",&customer.oldbalance);
printf(" Current payment:");
scanf("%f",&customer.payment);
printf(" Payment date(mm/dd/yyyy):");
scanf("%d/%d/%d",&customer.lastpayment.month,&customer.lastpayment.day,&customer.lastpayment.year);
return;
}
void writefile()
{
FILE *fp;
fp=fopen("bidur.dat","ab");
fwrite(&customer,sizeof(customer),1,fp);
fclose(fp);
return;
}
void search()
{
char ch;
char nam[100];
int n,i,m=1;
FILE *fp;
fp=fopen("bidur.dat","rb");
do{
printf("\nenter your choice:");
ch=getche();
}while(ch!='1' && ch!='2');
switch(ch){
case '1':
fseek(fp,0,SEEK_END);
tl=ftell(fp);
sl=sizeof(customer);
ts=tl/sl;
do{
printf("\nchoose customer number:");
scanf("%d",&n);
if(n<=0 || n>ts)
printf("\nenter correct\n");
else{
fseek(fp,(n-1)*sl,SEEK_SET);
fread(&customer,sl,1,fp);
output();
}
printf("\n\nagain?(y/n)");
ch=getche();
}while(ch=='y');
fclose(fp);
break;
case '2':
fseek(fp,0,SEEK_END);
tl=ftell(fp);
sl=sizeof(customer);
ts=tl/sl;
fseek(fp,(ts-1)*sl,SEEK_SET);
fread(&customer,sizeof(customer),1,fp);
n=customer.number;
do{
printf("\nenter the name:");
scanf("%s",nam);
fseek(fp,0,SEEK_SET);
for(i=1;i<=n;i++)
{
fread(&customer,sizeof(customer),1,fp);
if(strcmp(customer.name,nam)==0)
{
output();
m=0;
break;
}
}
if(m!=0)
printf("\n\ndoesn't exist\n");
printf("\nanother?(y/n)");
ch=getche();
}while(ch=='y');
fclose(fp);
}
return;
}
void output()
{
printf("\n\n Customer no :%d\n",customer.number);
printf(" Name :%s\n",customer.name);
printf(" Mobile no :%.f\n",customer.mobile_no);
printf(" Account number :%d\n",customer.acct_no);
printf(" Street :%s\n",customer.street);
printf(" City :%s\n",customer.city);
printf(" Old balance :%.2f\n",customer.oldbalance);
printf(" Current payment:%.2f\n",customer.payment);
printf(" New balance :%.2f\n",customer.newbalance);
printf(" Payment date :%d/%d/%d\n\n",customer.lastpayment.month,customer.lastpayment.day,customer.lastpayment.year);
printf(" Account status :");
textcolor(128+RED);
switch(customer.acct_type)
{
case 'C':
cprintf("CURRENT\n\n");
break;
case 'O':
cprintf("OVERDUE\n\n");
break;
case 'D':
cprintf("DELINQUENT\n\n");
break;
default:
cprintf("ERROR\\n\n");
}
textcolor(WHITE);
return;
}
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