Notes

#include <stdio.h>



#define line_Len 100



FILE *rd,*wr;



char path[] = "data.txt";



int years[line_Len];

int months[line_Len];

int dates[line_Len];

double payments[line_Len];

double outstanding[line_Len];

int readings[line_Len];

int lines = 0;



void startProgram();

int openFile();

void endProgram();

double calcBill(int days, int lastRead, int newRead);

double getDay(int year, int month, int date);

double calcDays(double startDay, double endDay);

void readFile();

void initProgramData();

void writeData();

void parseDataNext();

void whileLoop();

void newRead();

void newPayment();

void printPayments();

void printBills();



int main()

{

startProgram();



int rdStat = 0;

rdStat = openFile();

if (rdStat != 0) readFile();

else(initProgramData());



whileLoop();

return 0;

}



void startProgram()

{

printf(" Welcome to Electricity Bill Calculator ");

printf("n");



int i = 0;

for(i = 0 ; i < line_Len ; i ++ )

{

months[i] = -1;

payments[i] = -1;

readings[i] = -1;

}

}



int openFile()

{

int openStat = 1;

rd = fopen(path,"r");

if (rd == NULL)

{

openStat = 2;

printf("No Data File Found n");



}

else printf("Data File opened successfullyn");

return openStat;

}



void initProgramData()

{

int i = 0;

for(i = 0 ; i < line_Len ; i ++ )

{

years[i] = 0;

months[i] = 0;

dates[i] = 0;

payments[i] = 0;

outstanding[i] = 0;

readings[i] = 0;

}

printf("Please Input the Last Meter Reading Details.nReading Date (yyyy/mm/dd)..............: ");

scanf("%d/%d/%d", &years[1], &months[1], &dates[1]);

printf("kWh Meter Reading......................: ");

scanf("%d", &readings[1]);

printf("Last Month Bill Outstanding............: ");

scanf("%lf", &outstanding[1]);

printf("Total of Payments After Last Month Bill: ");

scanf("%lf", &payments[0]);

years[0] = years[1];

months[0] = months[1];

dates[0] = dates[1];

outstanding[0] = outstanding[1] - payments[0];

fclose(rd);

wr = fopen(path,"w");

fprintf(wr, "%dt%dt%dt%.2lft%.2lft%dn", years[0], months[0], dates[0], payments[0], outstanding[0], readings[0]);

fprintf(wr, "%dt%dt%dt%.2lft%.2lft%dn", years[1], months[1], dates[1], payments[1], outstanding[1], readings[1]);

fclose(rd);

}



void parseDataNext()

{

int i = 0;

for(i = line_Len - 1 ; i > 0 ; i --)

{

if(years[i-1] > 0)

{

years[i] = years[i-1];

months[i] = months[i-1];

dates[i] = dates[i-1];

payments[i] = payments[i-1];

outstanding[i] = outstanding[i-1];

readings[i] = readings[i-1];

}

}



i = 0;

years[i] = 0;

months[i] = 0;

dates[i] = 0;

payments[i] = 0;

outstanding[i] = 0;

readings[i] = 0;

}



void newRead()

{

parseDataNext();

printFullLine();

printf("New Reading Month(mm) : ");

scanf("%d", &months[0]);

printf("New kWh Meter Reading : ");

scanf("%d",&readings[0]);

int i = 1;

while (readings[i] == 0)

{

i ++;

}

printf("i = %dn", i);

double bill = calcBill(30,readings[i],readings[0]);

outstanding[0] = outstanding[1] + bill;

printf("This Month kWh Units : %dn",readings[0]-readings[i]);

printf("This Month Charge : %9.2lfn",bill);

writeData();

}



void newPayment()

{

parseDataNext();

printFullLine();

printf("Payment Month(mm) : ");

scanf("%d/%d/%d",&months[0]);

printf("Payment Amount : ");

scanf("%lf", &payments[0]);

outstanding[0] = outstanding[1] - payments[0];

printf("Total Outstanding : %9.2lfn",outstanding[0]);

writeData();

}



void printBills()

{

int i = 0;

int i1 = 0;

printf("ENERGY CONSUMPTION DETAILS");

for(i = 0 ; i < line_Len ; i ++)

{

if(readings[i] > 0)

{

i1 = i;

while(readings[i1] > 0)

{

i1++;

if(i1 >= line_Len)

{

i1 = i;

break;

}

}

if(i != i1)

{

double consum = readings[i] - readings[i1];

double bills = calcBill(30,readings[i1],readings[i]);

printf("t%d/%.2lft%.2lfn", months[i],consum, bills);

}

}

}

}



void printPayments()

{

int i = 0;

printf("PAYMENT DETAILSn");

printf(" Date tPaymentst Outstandingn");

for(i = 0 ; i < line_Len ; i ++)

{

if(payments[i] > 0)

{

printf("%4d/%2d/%2dt%9.2lftt%9.2lfn",months[i],payments[i]);

}

}

}



void whileLoop()

{

int i = 1;

char in = 0;

while (i)

{

printf("Please select task to executen");

printf("t1 - Add New kWh Readingn");

printf("t2 - Add Paymentn");

printf("t3 - View Consumption And Billsn");

printf("t4 - View Paymentsn");

printf("t5 - EXITn");



scanf("%d",&in);

switch (in)

{

case 1 :

newRead();

i = 1;

break;

case 2 :

newPayment();

i = 1;

break;

case 3 :

printBills();

i = 1;

break;

case 4 :

printPayments();

i = 1;

break;

case 5 :

i = 0;

break;

default :

printf("Wrong Inputn");

i = 1;

break;

}

}

writeData();

}



void writeData()

{



int i = 0;

wr = fopen(path,"w");

for(i = 0 ; i < line_Len ; i ++ )

{

if(years[i] > 0)

{

fprintf(wr, "%dt%dt%dt%.2lft%.2lft%dn", months[i], payments[i], readings[i]);

}

}

fclose(rd);

}



void readFile()

{

int i = 0;

while (fscanf(rd, "%dt%dt%dt%lft%lft%dn", &months[i], &payments[i], &readings[i]) != EOF)

{

i ++;

if(i >= line_Len) break;

}

}



double calcBill(int days, int lastRead, int newRead)

{

days = 30;

double bill = 0;

int units = newRead - lastRead;

if(units <= days )

{

bill = 30.0 + 2.50 * units;

}

else

{

bill = 2.50 * days;

if(units <= (days * 2))

{

bill = bill + 60.0 + 4.85 * (units - days);

}

else

{

bill = 7.85 * 2.0 * days;

if(units <= (days * 3))

{

bill = bill + 90.0 + 10.00 * (units - days * 2.0);

}

else

{

bill = bill + 10.00 * days;

if(units <= (days * 4))

{

bill = bill + 480.0 + 27.75 * (units - days * 3.0);

}

else

{

bill = bill + 27.75 * days;

if(units <= (days * 6))

{

bill = bill + 480.0 + 32.00 * (units - days * 4.0);

}

else

{

bill = bill + 32.00 * days;

if(units > (days * 6))

{

bill = bill + 540.0 + 45.00 * (units - days * 6.0);

}

}

}

}

}

}



return bill;

}