我正在使用C ++在Microsoft Visual Studio中编写一个程序，该程序将从.txt文件中检索信息。在该文件中有负数，但是当我尝试编写一个while循环，说明如果有负数时该怎么做，我会得到几个错误。
有人可以帮我这个吗？这是我的代码，我确实意识到有错误，但我无法弄清楚如何编写While循环语句来读取这些工作小时数和.txt文件中的小时费用
示例文本文件：
45.0 10.50
-35.0 7.75
50.0 12.00
45.0 -8.50
30.0 6.50
48.0 -10.25
-50.0 10.00
50.0 8.75
40.0 12.75
56.0 8.50
代码：
//*****************************
// This program is to help calculate an employee's weekly gross pay as well as
// the net pay while showing the taxes that were taken off.
// The data that will be shown will be calculated from a .txt file
// that was created and called employee.txt.
// Input: Will be the inFile known as employee.txt
// Output: Gross pay, taxable income, federal tax, state tax, and net pay
// Typed by:
// Date:
//******************************
#include <iomanip>
#include <fstream>
#include <iostream>
using namespace std;
float computeGross(float, float);
void computeTaxes(float, float&, float&, float&);
float computeNetPay (float&, float&, float&, float&);
const float hours = 40; // Regular 40 hour work week
const float ovTime = 1.5; // Overtime if hours go over 40
const float exemption = 200.0; // Exemption if pay goes over 200
const float fedTaxRate = 0.10; // Federal Tax Rate
const float stTaxRate = 0.03; // State Tax rate
ifstream inFile;
ofstream outFile;
int main()
{
inFile.open("employee.txt");
outFile.open("result.txt");
float hours, rate, grossPay, taxableIncome, fedTax, stTax, NetPay;
inFile >> hours >> rate;
while(inFile)
{
if {
(hours <= 0)&& (rate <= 0);
outFile << "Invalid Data";
}
else{
return 0;
}
}
grossPay = computeGross(hours, rate);
computeTaxes (grossPay, taxableIncome, fedTax, stTax);
computeNetPay (grossPay, fedTax, stTax, NetPay);
outFile << fixed << showpoint << setprecision(2);
outFile << "Hours worked = " << hours << endl
<< "Hourly rate = " << rate << endl
<< "Employee's gross pay = " << grossPay << endl
<< "Taxable Income = " << taxableIncome << endl
<< "Federal Taxes = " << fedTax << endl
<< "State Taxes = " << stTax << endl
<< "Net Pay = " << NetPay << endl;
return 0;
}
float computeGross (float h, float r) //Computes for the Gross Pay
{
if (h > hours)
return hours * r + (h - hours) * r * ovTime;
else
return h * r;
}
void computeTaxes(float g, float& taxable, float& fedTax, float& stTax) //Computes both Taxes
{
taxable = g - exemption;
if (taxable > 0.0)
{
fedTax = fedTaxRate * taxable;
stTax = stTaxRate * taxable;
}
else
{
fedTax = 0.0;
stTax = 0.0;
}
}
float computeNetPay (float& grossPay, float& fedTax, float& stTax, float& NetPay)
{
return NetPay = grossPay - fedTax - stTax;
}
答案 0 :(得分：2)
在您的主要功能中，您有：
while(inFile)
{
if ((hours <= 0) && (rate <= 0))
{
outFile << "Invalid Data";
}
else {
return 0;
}
}
当触发else时程序结束，main函数返回。你可能想要一个 continue 中断或者没有任何内容，返回语句结束主函数而不是While循环。
从文件中获取所有数据的读取语句（inFile >> hours >> rate）;
将需要在这个或另一个循环中。在IF测试有效性之后说，它可能在其他地方。
while(inFile)
{
if ((hours <= 0) && (rate <= 0)) {
outFile << "Invalid Data";
}
else {
// call the data functions
// save the returned values
}
//prime hours and rate for the next loop
inFile >> hours >> rate;
}
答案 1 :(得分：2)
嗯..我的猜测是你正在寻找的东西：
请注意：
if ((hours <= 0) && (rate <= 0))
更改为：
if ((hours <= 0) || (rate <= 0))
否则它将不会使用您提供的数据点击“无效数据”
//*****************************
// This program is to help calculate an employee's weekly gross pay as well as
// the net pay while showing the taxes that were taken off.
// The data that will be shown will be calculated from a .txt file
// that was created and called employee.txt.
// Input: Will be the inFile known as employee.txt
// Output: Gross pay, taxable income, federal tax, state tax, and net pay
// Typed by:
// Date:
//******************************
#include <iomanip>
#include <fstream>
#include <iostream>
using namespace std;
float computeGross(float, float);
void computeTaxes(float, float&, float&, float&);
float computeNetPay (float&, float&, float&, float&);
const float hours = 40; // Regular 40 hour work week
const float ovTime = 1.5; // Overtime if hours go over 40
const float exemption = 200.0; // Exemption if pay goes over 200
const float fedTaxRate = 0.10; // Federal Tax Rate
const float stTaxRate = 0.03; // State Tax rate
int main()
{
ifstream inFile ("employee.txt");
ofstream outFile ("result.txt");
float hours, rate, grossPay, taxableIncome, fedTax, stTax, NetPay;
if (inFile.is_open())
{
while (! inFile.eof() )
{
inFile >> hours;
inFile >> rate;
if ((hours <= 0) || (rate <= 0))
{
outFile << "Invalid Data";
}
else
{
grossPay = computeGross(hours, rate);
computeTaxes (grossPay, taxableIncome, fedTax, stTax);
computeNetPay (grossPay, fedTax, stTax, NetPay);
outFile << fixed << showpoint << setprecision(2);
outFile << "Hours worked = " << hours << endl
<< "Hourly rate = " << rate << endl
<< "Employee's gross pay = " << grossPay << endl
<< "Taxable Income = " << taxableIncome << endl
<< "Federal Taxes = " << fedTax << endl
<< "State Taxes = " << stTax << endl
<< "Net Pay = " << NetPay << endl;
}
}
}
return 0;
}
其余的是相同的
答案 2 :(得分：1)
首先，我认为：
if {
(hours <= 0)&& (rate <= 0);
outFile << "Invalid Data";
}
应该是这样的：
if ((hours <= 0) && (rate <= 0)) {
outFile << "Invalid Data";
}
请注意，要使代码在StackOverflow上正确格式化，您应该只使用空格，而不是制表符。我认为这是导致格式问题的原因。