C Graphics Program to Build Telecom Billing Management System in Command Line

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C Graphics Program to Build Telecom Billing Management System in Command Line

#include<stdio.h>
#include<conio.h>
#include<ctype.h>
#include<windows.h>
#include<stdlib.h>
struct subscriber
{
char phonenumber[20];
char name[50];
float amount;
}s;
void addrecords();
void listrecords();
void modifyrecords();
void deleterecords();
void searchrecords();
void payment();
char get;
int main()
{ int password;
int phonenumber;
char choice;
 
 
 
system("cls");
 
printf("\n\n\n\n\n\n\n\n\n**************************************************************");
printf("\n\t\t------WELCOME TO THE TELECOM BILLING MANAGEMENT SYSTEM---");
printf("\n\t\t****************************************************************");
Sleep(2000);
getch();
    system("cls");
while (1)
{
system("cls");
printf("\n Enter\n A : for adding new records.\n L : for list of records");
printf("\n M : for modifying records.\n P : for payment");
printf("\n S : for searching records.");
printf("\n D : for deleting records.\n E : for exit\n");
choice=getche();
choice=toupper(choice);
switch(choice)
{
case 'P':
payment();break;
case 'A':
addrecords();break;
case 'L':
listrecords();break;
case 'M':
modifyrecords();break;
case 'S':
searchrecords();break;
case 'D':
deleterecords();break;
case 'E':
system("cls");
printf("\n\n\t\t\t\tTHANK YOU");
printf("\n\n\n\n\n:\n\tFOR USING OUR SERVICE");
Sleep(2000);
exit(0);
break;
default:
system("cls");
printf("Incorrect Input");
printf("\nAny key to continue");
getch();
}
}
}
void addrecords()
{
FILE *f;
char test;
f=fopen("c:/file.ojs","ab+");
if(f==0)
{   f=fopen("c:/file.ojs","wb+");
system("cls");
printf("please wait while we configure your computer");
printf("/npress any key to continue");
getch();
}
while(1)
{
system("cls");
printf("\n Enter phone number:");
scanf("%s",&s.phonenumber);
printf("\n Enter name:");
fflush(stdin);
scanf("%[^\n]",&s.name);
printf("\n Enter amount:");
scanf("%f",&s.amount);
fwrite(&s,sizeof(s),1,f);
fflush(stdin);
system("cls");
printf("1 record successfully added");
printf("\n Press esc key to exit, any other key to add other record:");
test=getche();
if(test==27)
break;
}
fclose(f);
}
void listrecords()
{
FILE *f;
int i;
if((f=fopen("c:/file.ojs","rb"))==NULL)
exit(0);
system("cls");
printf("Phone Number\t\tUser Name\t\t\tAmount\n");
for(i=0;i<79;i++)
printf("-");
while(fread(&s,sizeof(s),1,f)==1)
{
printf("\n%-10s\t\t%-20s\t\tRs. %.2f /-",s.phonenumber,s.name,s.amount);
}



printf("\n");
for(i=0;i<79;i++)
printf("-");
 
fclose(f);
getch();
}
void deleterecords()
{
FILE *f,*t;
int i=1;
char phonenumber[20];
if((t=fopen("c:/temp.ojs","w+"))==NULL)
exit(0);
if((f=fopen("c:/file.ojs","rb"))==NULL)
exit(0);
system("cls");
printf("Enter the phone number to be deleted from the Database");
fflush(stdin);
scanf("%[^\n]",phonenumber);
while(fread(&s,sizeof(s),1,f)==1)
{
if(strcmp(s.phonenumber,phonenumber)==0)
{       i=0;
continue;
 
}
else
fwrite(&s,sizeof(s),1,t);
}
if(i==1)
{       system("cls");
printf("Phone number \"%s\" not found",phonenumber);
remove("c:/file.ojs");
rename("c:/temp.ojs","c:/file.ojs");
getch();



fclose(f);
fclose(t);
main();
}
remove("c:/file.ojs");
rename("c:/temp.ojs","c:/file.ojs");
system("cls");
printf("The Number %s Successfully Deleted!!!!",phonenumber);
fclose(f);
fclose(t);
getch();
}
void searchrecords()
{
FILE *f;
char phonenumber[20];
int flag=1;
f=fopen("c:/file.ojs","rb+");
if(f==0)
exit(0);
fflush(stdin);
system("cls");
printf("Enter Phone Number to search in our database");
scanf("%s", phonenumber);
while(fread(&s,sizeof(s),1,f)==1)
{
if(strcmp(s.phonenumber,phonenumber)==0)
{ system("cls");
printf(" Record Found ");
printf("\n\nPhonenumber: %s\nName: %s\nAmount: Rs.%0.2f\n",s.phonenumber,s.name,s.amount);
flag=0;
break;
}
else if(flag==1)
{ system("cls");
printf("Requested Phone Number Not found in our database");



}
}
getch();
fclose(f);
}
void modifyrecords()
{
FILE *f;
char phonenumber[20];
long int size=sizeof(s);
if((f=fopen("c:/file.ojs","rb+"))==NULL)
exit(0);
system("cls");
printf("Enter phone number of the subscriber to modify:");
scanf("%[^\n]",phonenumber);
fflush(stdin);
while(fread(&s,sizeof(s),1,f)==1)
{
if(strcmp(s.phonenumber,phonenumber)==0)
{
system("cls");
printf("\n Enter phone number:");
scanf("%s",&s.phonenumber);
printf("\n Enter name: ");
fflush(stdin);
scanf("%[^\n]",&s.name);
printf("\n Enter amount: ");
scanf("%f",&s.amount);
fseek(f,-size,SEEK_CUR);
fwrite(&s,sizeof(s),1,f);
break;
}
}
fclose(f);
}
void payment()
{
FILE *f;
char phonenumber[20];
long int size=sizeof(s);
float amt;
int i;
if((f=fopen("c:/file.ojs","rb+"))==NULL)
exit(0);
system("cls");
printf("Enter phone number of the subscriber for payment");
scanf("%[^\n]",phonenumber);
fflush(stdin);
while(fread(&s,sizeof(s),1,f)==1)
{
if(strcmp(s.phonenumber,phonenumber)==0)
{
system("cls");
printf("\n Phone No.: %s",s.phonenumber);
printf("\n Name: %s",s.name);
printf("\n Current amount: %f",s.amount);
printf("\n");
for(i=0;i<79;i++)
printf("-");
printf("\n\nEnter amount of payment :");
fflush(stdin);
scanf(" %f",&amt);
s.amount=s.amount-amt;
fseek(f,-size,SEEK_CUR);
fwrite(&s,sizeof(s),1,f);
break;
}
}
system("cls");
printf("THANK YOU %s FOR YOUR TIMELY PAYMENTS",s.name);
getch();
fclose(f);
}

Ranjith Kumar

Hi, I'm Ranjith a full-time Blogger, YouTuber, Affiliate Marketer, & founder of Coding Diksha. Here, I post about programming to help developers.

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