tip calculator

[arslana]

The waitstaff at a restaurant would like to determine the percentage (20%?, 15%?) left as tip by each customer. For comparison, the staff would also like to see how much the standard tip should be for a bill (e.g., $20 on $100).
left as tip and standard tip amount to be based on a customer’s total bill.

plz help how to do this?

[eyenrique]

what's your problem? math calculation? or how to code it?

I just can figure something like this:

//percentage.cpp
//tip calculator

#include <iostream>
using std::cout;
using std::cin;
using std::endl;

double getTipPercentage(double total);

int main(){

int total;

cout<<"Enter total bill to calculate tip: ";
cin>>total;
cout<<"Total :"<<total<<'\n'
	<<"Tip: "<<getTipPercentage(total)<<endl;


return 0; //indicates success
}//end main

double getTipPercentage(double total){
	double tip;
		tip=total*0.20;
return tip;
}//end function getTipPercentage 

Eyenrique-MacBook-Pro:Study Eyenrique$ ./percentage 
Enter total bill to calculate tip: 120
Total :120
Tip: 24

[arslana]

math calculation, how would i code this in C?

[eyenrique]

C is not equal to C++

do you -mandatory- have to use stdio.h functions? (printf(),scanf())

because in C++ you -normally- use the iostream library and use cout and cin objects!

[arslana]

yes i have to use stdio.h functions. include printf, scanf

[eyenrique]

To be honest i don't remember so much about C, but i can figure out this:
-i don't know how to control decimal precision in C-

//percentage.c
//tip calculator

#include <stdio.h>

float getTipPercentage(float total);

int main(){

float total;
float tip;

printf("Enter total bill to calculate tip: ");
scanf("%f",&total);
tip=getTipPercentage(total);
printf("\nTotal: %f ",total);
printf("\nTip: %f ",tip);
printf("\n");

return 0; //indicates success
}//end main

float getTipPercentage(float total){
	float tip;
	float perc=0.20;
		tip=total*perc;
return tip;
}//end function getTipPercentage

Enter total bill to calculate tip: 120

Total: 120.000000 
Tip: 24.000000

[arslana]

well, you were a lot more help then any other coder, thank you so much...

[eyenrique]

You are welcome!
can you help to me?
Allow private messages on Account settings to send to you a private message.

[arslana]

ok, i changed it.