1
我試圖從文本文件中獲取輸入,並使用getline()將數據放入四個向量中。該文件包含兩個字符串,一個double和一個整數,全部位於不同的行上,每個組由一個空行分隔。getline()和向量問題(C++)
if (userChoice == 1) // Load
{
in_stream.open("Lab11.txt");
if (in_stream.fail())
{
cerr << "File does not exist" << endl;
system("PAUSE");
exit(1);
}
index = 0;
do
{
getline(in_stream, itemNumb[index]);
getline(in_stream, itemName[index]);
getline(in_stream, itemCost[index]);
getline(in_stream, itemQuant[index]);
index++;
} while (! in_stream.eof());
in_stream.close();
itemStored = 0;
cout << "Items stored: " << itemStored << endl;
}
itemNumb和itemName是字符串矢量,itemCost是double,itemQuant是整數。字符串的行不會給出錯誤,但double和整數的行會給出相同的錯誤,並且類型會根據哪個向量發生更改。
錯誤:
no matching function for call to getline(std::ifstream&, double&)'|
任何幫助將不勝感激! 編輯:全碼
#include <iostream>
#include <cstdlib>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
using namespace std;
void Add(vector<string>& itemNumb, vector<string>& itemName, vector<double>& itemCost, vector<int>& itemQuant, string name, string numb, double cost, int quant, int length, int index);
void Search(vector<string>& itemNumb, vector<string>& itemName, vector<double>& itemCost, vector<int>& itemQuant);
void List(vector<string> itemNumb, vector<string> itemName, vector<double> itemCost, vector<int> itemQuant, int length, int index);
int main()
{
ifstream in_stream;
ofstream out_stream;
vector<string> itemName, itemNumb;
vector<double> itemCost;
vector<int> itemQuant;
string name = "000", numb = "000";
double cost = 0.0;
int quant = 0, length = 0, index = 0;
int userChoice, itemStored;
do
{
cout << "===========================" << endl << "1) Load" << endl << "2) Add" << endl <<
"3) Search" << endl << "4) List" << endl << "5) Save" << endl << endl << "0) Exit" << endl;
cout << "Choose an option" << endl;
cin >> userChoice;
if (userChoice == 1) // Load
{
in_stream.open("Lab11.txt");
if (in_stream.fail())
{
cerr << "File does not exist" << endl;
system("PAUSE");
exit(1);
}
index = 0;
do
{
getline(in_stream, itemNumb[index]);
getline(in_stream, itemName[index]);
in_stream >> itemCost[index];
in_stream >> itemQuant[index];
index++;
} while (! in_stream.eof());
in_stream.close();
itemStored = itemNumb.size();
cout << "Items stored: " << itemStored << endl;
}
else if (userChoice == 2) // Add
{
Add(itemNumb, itemName, itemCost, itemQuant, name, numb, cost, quant, length, index);
itemStored++; // Function seems to sort oddly when strings of varying lengths are compared
cout << endl;
cout << itemStored << " items stored" << endl;
cout << endl;
}
else if (userChoice == 3) // Search
{
Search(itemNumb, itemName, itemCost, itemQuant);
}
else if (userChoice == 4) //List
{
List(itemNumb, itemName, itemCost, itemQuant, length, index);
}
else if (userChoice == 5) //Save
{
out_stream.open("Lab11.txt", ios::app);
if (out_stream.fail())
{
cerr << "File does not exist" << endl;
system("PAUSE");
exit(1);
}
index = 0;
length = itemNumb.size();
while (index != length)
{
out_stream << endl;
out_stream << itemNumb[index] << endl;
out_stream << itemName[index] << endl;
out_stream << itemCost[index] << endl;
out_stream << itemQuant[index] << endl;
index++;
}
out_stream.close();
}
}
while (userChoice != 0);
}
編輯文件IO的線,導致運行錯誤
do
{
getline(in_stream, tempstr1);
itemNumb.push_back(tempstr1);
getline(in_stream, tempstr2);
itemNumb.push_back(tempstr2);
in_stream >> tempdoub;
itemCost.push_back(tempdoub);
in_stream >> tempint;
itemQuant.push_back(tempint);
index++;
} while (! in_stream.eof());
in_stream.close();
我把它改成你放什麼,但現在,如果語句導致程序崩潰。 –
你能發佈完整的代碼嗎?也許,向量中沒有足夠的空間? – soon
所有這一切都不會,但過去應該不會對它產生影響。 –