C++ C++;:什么';我在这里使用Stringstream有什么问题吗?
我昨天发布了这个程序(如果你昨天没有看到,我在下面重新发布了一个基本摘要),你们向我展示了布尔逻辑的错误,所以一切都按照我的要求运行,但是如果我使用while(infle)或while(!infle.eof())等,我会处理最后一行两次。因此,我想使用stringstream,这样我可以逐行处理输入 由于输入数据不仅仅是一种数据类型(它是int、int、char、char、float),因此我以以下方式使用了stringstream(如下代码所示): 这些是我试图在输入文件中以正确顺序读取的变量。发生的情况是,我的账单\报表文本文件中有4行输出,错误\报告文本文件中有3行输出(输入文本文件中总共有13行)。似乎有些线路可能会合并。感谢您的帮助 谢谢 输入文件: 10.0新加坡元100.00 27三维Y 57.50 125 17 D N 0.00 40新南威尔士州25.00 0 25 S Y 23.75 250 43 D N 500.00 0 0 D N 0.0 10.0 R Y 10.00 17 3 D R 15.00 50DY275.00 -3 10日Y 20.00 14-1新南威尔士州30.00 20三维Y-10.00 这里有一个链接到我昨天的帖子,它解释了我的程序,虽然我的具体问题不需要它C++ C++;:什么';我在这里使用Stringstream有什么问题吗?,c++,fstream,stringstream,C++,Fstream,Stringstream,我昨天发布了这个程序(如果你昨天没有看到,我在下面重新发布了一个基本摘要),你们向我展示了布尔逻辑的错误,所以一切都按照我的要求运行,但是如果我使用while(infle)或while(!infle.eof())等,我会处理最后一行两次。因此,我想使用stringstream,这样我可以逐行处理输入 由于输入数据不仅仅是一种数据类型(它是int、int、char、char、float),因此我以以下方式使用了stringstream(如下代码所示): 这些是我试图在输入文件中以正确顺序读取的变量
#包括
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使用名称空间std;
void getData(int&,int&,char&,char&,float&);
无效检查有效(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&);
河流充填;
流出流文件(“Billing_Statement.txt”);
流错误报告(“error\u Report.txt”);
//将税率和周末附加费声明为常量。
常量浮动税率=0.18;
const float weekendsource=.07;
int main()
{
bool valid=true;
浮动工资;
浮动总税;
浮动总附加费;
浮置;
int numAdults;
国际儿童;
字符类型;
字符日型;
浮动存款额;
弦线;
问题是您的getData()
函数正在从infle
读取输入:一行由std::getline()
读取,下一行在getData()
中读取。看起来,getData()
的目的是读取嵌套中实际读取的数据,而。现在,getData()
实际上是有害的。我会将代码更改为
不要使用嵌套的while
-循环,而是使用if
-语句
如果无法读取该行,即在if
的else
分支中打印该行
删除getData()
的使用和可能的实现
缩进代码以反映其结构
当然,我只是'\n'
不需要close()
文件,因为各个流的析构函数无论如何都会这样做(只需要在处理错误时使用close()
)
谢谢-我不敢相信我忘记了getData函数。删除它本身就解决了我的问题。我还担心我过度使用引用-如果是,请有人指出我何时/如果这样做?
while (getline(inFile, line)){
istringstream ss(line);
while(ss >> numAdults >> numChildren >> mealType >> dayType >> depositAmount){
#include <iostream>
#include <fstream>
#include <iomanip>
#include <sstream>
#include <string>
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;
string line;
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 (getline(inFile, line)){
istringstream ss(line);
while(ss >> numAdults >> numChildren >> mealType >> dayType >> depositAmount){
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;
}