我如何得到正确的答案？

问题描述

/* 	Program:		prog3.cpp
	By:				Mackenzie Ritter
	Last Modified:	Oct 31, 2017
	Purpose:		To give customer their cost based on amount of books purchased.
	Notes:
*/
#include
#include

using namespace std ;

void Instructions () ;
void numBooks () ;
void totalCost (int) ;
void percentoff (float) ;
void finalCost (float, float) ;
void receipt (int, float, float, float) ;

int main ()
{
	int books ;
	float total, cost, discount ;
	Instructions () ;
	numBooks () ;
	totalCost (books) ;
	percentoff (total) ;
	finalCost (discount, total) ;
	receipt (books, total, discount, cost) ;
}

void Instructions ()
{
	cout > books ;
}

void totalCost (int books)
{
	float total = books * 8.99 ;
}

void percentoff (float total)
{
	float discount = 0.15 * total ;
}

void finalCost (float discount, float total)
{
	float cost = total - discount ;
}

void receipt (int books, float total, float discount, float cost)
{
	cout << books << endl ;
	cout << "$" << total << endl ;
	cout << discount << "% off" << endl ;
	cout << "$" << cost << endl ;
}

我的尝试：



我试过调整参数因为我认为我以前错了。当我运行程序时，它给了我奇怪的输出。例如，当它要求我提供一些书籍时，我将输入2并且程序将给予

-2091432192

$ 4.59163e-41

0％off

$ 0

如果你能帮助我，我将不胜感激。

What I have tried:

I have tried adjusting the parameters because I believe I had them wrong before. When I run the program, it gives me strange output. For example, when it asks me for a number of books, I will enter 2 and the program will give
"-2091432192
$4.59163e-41
0% off
$0"
If you could help me, I would greatly appreciate it.

推荐答案

我尝试了什么：



我试过调整参数因为我相信我有它们以前错了。当我运行程序时，它给了我奇怪的输出。例如，当它要求我输入一些书时，我将输入2并且程序将给出

-2091432192

What I have tried:

I have tried adjusting the parameters because I believe I had them wrong before. When I run the program, it gives me strange output. For example, when it asks me for a number of books, I will enter 2 and the program will give
"-2091432192

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