#include <stdio.h>
#include <conio.h>

#define rate .10
#define discounta .50
#define discountb .15
#define tax .04

void getStartTime(int time);
void getLengthofCall(int length);
void calcGross(int time, int length, double gross);
void calcNet(int time, int length,double gross, double net);
void displayReport(double gross, double net, char input);
void end();

int main()
{
    int time;
    int length;
    double gross;
    double net;
	char input;
    
    getStartTime(time);
    getLengthofCall(length);
    calcGross(time, length, gross);
    calcNet(time, length, gross, net);
    displayReport(gross, net, input);
	return 0;
}

void getStartTime(int time)
{
     printf("Please input start time: ");
     scanf("%d", &time);
	 if(time >= 2401 || time <= -1)
	 {
		 printf("Invalid time. Please input a time between 0 and 2400.\n\n");
		 main();
	 }
}

void getLengthofCall(int length)
{
     printf("Please input call length: ");
     scanf("%d", &length);
}

void calcGross(int time, int length, double gross)
{
    if(time <= 800 || time >= 1800 && time <= 60)
    {
        gross = length*rate*discounta;
    }
    else if(time <= 800 || time >= 1800 && time >= 60)
    {
        gross = length*rate*discounta*discountb;
    }
    else
    {
        gross = length*rate;      
    }
}

void calcNet(int time, int length, double gross, double net)
{
    if(time <= 800 || time >= 1800 && time <= 60)
    {
        net = gross*tax+gross;
    }
    else if(time <= 800 || time >= 1800 && time >= 60)
    {
        net = gross*tax+gross;
    }
    else
    {
        net = gross*tax+gross;       
    }
}
void displayReport(double gross, double net, char input)
{
     printf("\nGross: %lf\nNet: %lf", gross, net);
	 printf("\nYou may enter another set by hitting the n key.\n");
	 printf("\nYou may exit this program by hitting the e key.\n");
	 scanf("%s", &input);
	 if (input!='e')
	 {
	 	main();
	 }
	 else if(input='e')
	 {
		 end();
	 }
}
void end()
{
     printf("\n\nThank you for using this phone calculator program!\n");
}

Please input start time: 1600
Please input call length: 15

Gross: -92559631349317831000000000000000000000000000000000 000000000000.000000
Net: -92559631349317831000000000000000000000000000000000 000000000000.000000
You may enter another set by hitting the n key.

You may exit this program by hitting the e key.