该程序基本上应该从文件中读取数据，然后根据其内容处理该数据。这有点像一家模拟餐饮公司，变量是成人人数、儿童人数、膳食类型（豪华或标准）、一天类型（周末[是或否]、初始押金等以及附加费、税金） , total 等在 CalcData 函数中计算，具体取决于该数据是什么（即如果是豪华餐（D 或 S），价格是 25.80 美元，而不是 21.75 美元（标准），如果是周末（是或否），附加费加到总账单中，并根据总金额给予折扣）。
虽然我认为我在我的函数中过度使用了引用，但程序在没有错误检查部分的情况下运行良好（即检查输入是否有效 - 成人/儿童/初始存款的数量没有负数，除了 S/ 没有其他字母D 和/或 Y/N 等）。我最初使用了一个返回 bool 的“isValid”函数和一个“outputErrorFile”函数，并在 main 中使用 if/else - 如果数据无效，则输出到错误文件，如果它不是无效的，然后只是将其输出到“帐单”文本文件。我将两者结合在一个“checkValid”函数中。我认为做同样的事情，所以没有必要有两个单独的功能。
现在它正在将所有内容输出到错误文件（具体来说，布尔变量“valid”在我的所有数据上始终为假）。我确定我在里面做了一些愚蠢的事情。我并不真正关心输出到控制台的内容，只关心输出到文本文件的内容...感谢您的关注。
谢谢。
输入文件（成人、儿童、豪华或标准餐、周末（Y/N）、初始存款）：
10 0 SY 100.00
27 3 岁 57.50
125 17 DN 0.00
4 0 序列号 25.00
0 25 SY 23.75
250 43 DN 500.00
0 0 DN 0.0
10 0 里亚尔 10.00
17 3 博士 15.00
5 0 元 275.00
-3 10 元 20.00
14 -1 SN 30.00
20 3 岁 -10.00
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
void getData(int &, int &, char &, char &, float &);
void checkValid(int &, int &, char &, char &, float &, bool &);
void calcData(int, int, char, char, float, float &, float &, float &, float &);
void sendData(int, int, char, char, float, float &, float &, float &, float &);
ifstream inFile;
ofstream outFile("Billing_Statement.txt");
ofstream error_Report("Error_Report.txt");
//Declare the tax rate and weekend surcharge as constants.
const float taxRate = 0.18;
const float weekendSurcharge = .07;
int main()
{
bool valid = true;
float mealCost;
float totalTax;
float totalSurcharge;
float discountAmount;
int numAdults;
int numChildren;
char mealType;
char dayType;
float depositAmount;
cout << "\nThis program will calculate data for a catering company " << endl;
outFile << " Adults " << "Children " << "Meal " << " Weekend " << setw(9) << "Deposit "
<< setw(6) << "Tax" << setw(11) << "Surcharge" << setw(10) << "Discount" << setw(12) <<
"Meal Cost" << endl;
error_Report << " Adults " << "Children " << "Meal " << " Weekend " << setw(9) <<
"Deposit " << endl;
inFile.open("file.txt");
if (!inFile) {
cout << "nError: File could not be opened. ";
exit(1);
}
while (!inFile.eof()) {
getData(numAdults, numChildren, mealType, dayType, depositAmount);
checkValid(numAdults, numChildren, mealType, dayType, depositAmount, valid);
if (valid == true)
{
calcData(numAdults, numChildren, mealType, dayType, depositAmount, totalTax,
totalSurcharge, discountAmount, mealCost);
sendData(numAdults, numChildren, mealType, dayType, depositAmount, mealCost,
totalTax, totalSurcharge, discountAmount);
}}
cout << "\nA copy of this has created for your convenience in the file,
\"Billing_Statement.txt \"" << endl;
inFile.close();
outFile.close();
error_Report.close();
return 0;
}
void getData(int &numAdults, int &numChildren, char &mealType, char &dayType, float
&depositAmount)
{
inFile >> numAdults >> numChildren >> mealType >> dayType >> depositAmount;
}
void checkValid(int &numAdults, int &numChildren, char &mealType, char &dayType, float
&depositAmount, bool & valid)
{
if (numAdults < 0 || numChildren < 0)
valid = false;
else if (mealType != 'D' || mealType != 'S')
valid = false;
else if (dayType != 'Y' || dayType != 'N')
valid = false;
else if (depositAmount < 0)
valid = false;
else
valid = true;
if (valid == false) {
error_Report << setw(7) << numAdults << setw(9) << numChildren << setw(6) << mealType <<
setw(9) << dayType << setw(9) << right << depositAmount << setw(8) << endl;
}
}
void calcData(int numAdults, int numChildren, char mealType, char dayType, float
depositAmount, float &totalTax, float &totalSurcharge, float &discountAmount, float
&mealCost)
{
if (mealType == 'S') {
mealCost = ((numAdults * 21.75) + (numChildren * (21.75 * .60)));
totalTax = mealCost * taxRate;
mealCost += taxRate;
if (dayType == 'Y') {
totalSurcharge = mealCost * weekendSurcharge;
mealCost += totalSurcharge;
}}
else {
mealCost = ((numAdults * 25.80) + (numChildren * (25.80 * .60)));
totalTax = mealCost * taxRate;
mealCost += taxRate;
if (dayType == 'Y') {
totalSurcharge = mealCost * weekendSurcharge;
mealCost += totalSurcharge;
}
}
if (mealCost < 100) {
discountAmount = .015 * mealCost;
mealCost -= discountAmount;
}
else if (mealCost >= 100 && mealCost < 400) {
discountAmount = .025 * mealCost;
mealCost -= discountAmount;
}
else if (mealCost >= 400) {
discountAmount = .035 * mealCost;
mealCost -= discountAmount;
}
}
void sendData(int numAdults, int numChildren, char mealType, char dayType, float
depositAmount, float &mealCost, float &totalTax, float &totalSurcharge, float
&discountAmount)
{
outFile << fixed << showpoint << setprecision(2);
outFile << setw(7) << numAdults << setw(9) << numChildren << setw(6) << mealType <<
setw(9) << dayType << setw(9) << right << depositAmount << setw(8) << totalTax <<
setw(10) << totalSurcharge << setw(10) << right << discountAmount << setw(12) << right
<< mealCost << endl;
}