[英]C++ Not inserting first line of data to output file
我是C ++的新手,一直在努力获取数据文件并读取它,然后对该数据进行一些数学运算,然后将其全部导出到输出文件中。 但是我的问题是,每次运行它都会跳过将第一行写入输出文件的过程。
我的数据文件是:
Jon Doe 15 7.25
Nick Delgado 8 7.25
Jo Barnes 4 7.25
Harold Griffith 45 11.00
Linda Holmes 30 10.00
我的输出如下所示:
Nick Delgado 8 7.25 58 0 58
Jo Barnes 4 7.25 29 0 29
Harold Griffith 45 11 522.5 146.3 376.2
Linda Holmes 30 10 300 84 216
它完全跳过了写有关乔恩·多伊的任何信息。 这是:
Jon Doe 15 7.25 108.75 0 108.75
我尝试了多种不同的想法,问我的朋友,总的来说,我感到非常沮丧。
我认为问题代码在这里的某个地方:
if (!dataOutFile.is_open()) {
cout << "Couldn't open file";
}
else {
dataOutFile << firstName << " " << lastName << " " << hoursWorked << " " << payRate << " " << grossPay << " " << withHolding << " " << takeHomePay << endl;
cout << "What was wrote to file: \n" << firstName << " " << lastName << " " << hoursWorked << " " << payRate << " " << grossPay << " " << withHolding << " " << takeHomePay << endl;
}
因为我的输出窗口如下所示:
因此,这告诉我的是,它正在到达代码写入文件的位置,因为它正在写入第一个条目之后的其他四个条目。 但是,根据输出窗口,它正在将文件应有的信息写入文件,但是由于某种原因,它不是。 我正在使用append命令,因此它不应覆盖任何内容,根据输出文件,它不是,而是第一行。
没有错误或警告,并且我的调试日志中没有错误。 请帮助我,任何帮助表示赞赏。 我也意识到代码有点混乱,我需要将其分解为更多的功能,但是我只是想使其正常工作,然后我才能对其进行清理。
下面是我处理所有这些程序的完整代码,以防有人需要查看。
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
// Global Variables
string fileName;
double totalGrossPay = 0;
double totalWithHolding = 0;
double totalTakeHomePay = 0;
double withHoldingLimit = 200;
double withHoldingRate = .28;
double overtimeRate = 1.5;
// Initialize Functions
void readFile();
int main() {
cout << "What is the name of your file?" << endl;
getline(cin, fileName);
readFile();
}
void readFile() {
// Variables
string firstName;
string lastName;
double hoursWorked;
double payRate;
double grossPay;
double withHolding;
double takeHomePay;
double overtime;
string dataOutFileName = "Salary.out";
// Intialize and Open Input File
ifstream file;
file.open(fileName);
// Initialize Output File
ofstream dataOutFile(dataOutFileName);
// Check to see if file failed to open
if (!file.is_open()) return;
// Define variables needed in the while loop.
string word;
int i = 1;
// Actually reads through the file and prints out what the file has.
while (i != 0) {
// Pull up the next word in the word file
file >> word;
// Firstname
if (((i - 1) % 4) == 0) {
firstName = word;
cout << "First name: " << firstName << "\n";
}
// Last name
else if (((i - 1) % 4) == 1) {
lastName = word;
cout << "Last name: " << lastName << "\n";
}
// Hours Worked
else if (((i - 1) % 4) == 2) {
hoursWorked = atof(word.c_str());
cout << "Hours Worked: " << hoursWorked << "\n";
}
// Pay Rate
else if (((i - 1) % 4) == 3) {
payRate = atof(word.c_str());
cout << "Pay Rate: " << payRate << "\n";
}
// Add 1 to i
i++;
// If i-1 divides into 4 with no remainder, move to new line
// Also since we now have all four variables filled in we can do our math
if (i > 3 && ((i - 1) % 4) == 0) {
// Gross Pay
if (hoursWorked > 40) {
overtime = hoursWorked - 40;
}
else {
overtime = 0;
}
if (overtime != 0) {
grossPay = (40 * payRate) + (overtime * (payRate * overtimeRate));
}
else {
grossPay = hoursWorked * payRate;
}
// Withholding
if (grossPay > withHoldingLimit) {
withHolding = grossPay * withHoldingRate;
}
else {
withHolding = 0;
}
// Take Home pay
takeHomePay = grossPay - withHolding;
// Add to totals
totalGrossPay += grossPay;
totalWithHolding += withHolding;
totalTakeHomePay += takeHomePay;
// Write to file, and print the line so we know it worked!
dataOutFile.open(dataOutFileName, fstream::app);
// Check it if is open
if (!dataOutFile.is_open()) {
cout << "Couldn't open file";
}
else {
dataOutFile << firstName << " " << lastName << " " << hoursWorked << " " << payRate << " " << grossPay << " " << withHolding << " " << takeHomePay << endl;
cout << "What was wrote to file: \n" << firstName << " " << lastName << " " << hoursWorked << " " << payRate << " " << grossPay << " " << withHolding << " " << takeHomePay << endl;
}
dataOutFile.close();
// move to new line
cout << "\n";
}
// Check to see if were at the end of the file, if so end while.
if (file.eof()) {
i = 0;
}
}
file.close();
}
基于i的状态机太复杂了,这里完全不需要。 不要修复它,把它扔掉。
如果您需要阅读四件事,请一次阅读四件事。 在while条件下进行。
ifstream file(filename);
ofstream dataOutFile(dataOutFileName);
while (file >> firstName >> lastName >> hoursWorked >> payRate)
{
// you have all four pieces of data
// calculate and print what you need here
}
不要在循环内调用close()
或检查eof()
。
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