[英]Cin.getline Won't Print Right nor Work Properly
在下面的代碼中,我試圖在文本文件中添加一行信息。 目前,我嘗試了3種不同的選擇,但沒有一個完全起作用。 (cin.get,cin.getline和cin >>)
例如,當我嘗試使用cin.getline(name,60)時,它將接受該信息,但會出現一些打印輸出錯誤(不是編譯錯誤,但它們顯示錯誤)。
1)如果我將分配鍵入為1-Web,則它在cin.getline中接受它;但是如果我輸入1-Web設計第1部分應用程序,然后按Enter鍵,我的程序將無休止地循環菜單選項,並且不接收信息。
2)當我打印文件時,它打印出來很奇怪
例如:
Accept from the following options to proceed.
1) Add Assignment
2) Remove Assignment
3) Print Listing
4) Quit
1
In our system we show Class information.
Enter class name with class number like so: (MCS 220)
MCS 299
Enter the Project Number < - > then Project title like so: (1 - Web Design Part Application)
1 - Web
Enter the due date for assignment like so: (05-12-2015)
05-12-2015
打印:
COMPSCI 181,Project 5 - Web page development,04-14-2015
MCS 220,Project 3 - Java fundamentals,04-15-2015
MCS 220,Project 4 - Array, 04-15-2015
, Project CS 299, - We-05-1 // Prints this line
任何幫助表示贊賞! 老實說,當我閱讀文件時,我很生銹。 這是我第一次添加文件,因此希望您能解釋為什么我遇到此問題,並可能幫助我解決它。
下面是我當前的函數,它添加了一行和我的主文件代碼。
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <cstdlib>
using namespace std;
int options = 0;
char name[60];
//string name; //this was when I attempted cin >>
//string assign; // this was when I attempted cin >>
char assign[60];
string date;
string lines;
void addProject () {
cout <<"Enter class name with class number like so: (MCS 220)"<<endl;
cin.getline(name, 60);
cin.ignore();
//cin >> name;
cout <<endl;
cout <<"Enter the Project Number < - > then Project title like so:" <<
" (1 - Web Design Part Application)"<<endl;
cin.getline(assign, 60);
cin.ignore();
//cin >> assign;
cout <<endl;
cout << "Enter the due date for assignment like so: (05-12-2015)"<<endl;
char cMonth[3];
char cDay [3];
char cYear[5];
cin.get(cMonth,3, '-');
cin.ignore(2, '-');
cin.get(cDay, 4, '-');
cin.ignore(2,'/');
cin.get(cYear, 5);
//input into file
ofstream readFile;
readFile.open("list.txt", std::ios::app);
readFile << name << ", " << "Project " << assign << ", "
<< cMonth <<"-"<< cDay <<"-"<< cYear<< endl;
}
//BEGIN MAIN CODE
int main() {
ifstream readFile("list.txt");
if (!readFile){
cout <<"I am sorry but we could not process "<<
"the file information."<<endl;
}
menu();
cin >>options;
cout <<endl;
cout <<"In our system we show Class information."<<endl;
//read and output the file
while (options != 4)
{
//print the listing
if (options == 3){
while (getline(readFile, lines)){
cout << lines<<endl;
}
}
// Add Assignments
if (options == 1){
addProject();
}
menu();
cin >>options;
cout <<endl;
}//end while
readFile.close();
}
我更新了我的代碼。 問題在於將cin.ignore放置在下一個cin變量的右邊。
char name[256];
char pnum[20];
char title[256];
string date;
string lines;
void addProject () {
cout <<"Enter class name with class number like so: (MCS 220)"<<endl;
cin.ignore(numeric_limits<std::streamsize>::max(), '\n');
cin.getline(name, 256, '\n');
//char upperName = toupper(name); /*
for (char *caps = name; *caps != '\0'; ++caps)
{
*caps = std::tolower(*caps);
++caps;
}
cout <<endl;
cout <<"Enter the Project Number: "<<endl;
cin.getline(pnum, 20, '\n');
cin.ignore(numeric_limits<std::streamsize>::max(), '\n');
cout<<"Enter the Project's title next: "<<endl;
cin.getline(title, 256, '\n');
cin.ignore(numeric_limits<std::streamsize>::max(), '\n');
cout <<endl;
cout << "Enter the due date for assignment like so: (05-12-2015)"<<endl;
char cMonth[3];
char cDay [3];
char cYear[5];
cin.get(cMonth,3, '-');
cin.ignore(2, '-');
cin.get(cDay, 4, '-');
cin.ignore(2, '-');
cin.get(cYear,5);
//input into file
ofstream readFile;
readFile.open("list.txt", std::ios::app);
readFile << name <<",Project "<< pnum << " - " << title <<
", "<< cMonth <<"-" <<cDay <<"-"<< cYear<< endl;
}
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