这是我在Java中学习了3个类之后第一次使用C ++进行编程(因此,这里绝对是初学者)。作业提示我添加到文本文件,然后在文本文件中搜索名称(在本例中为我的名字)。它运行得很好,然后我试图让它显示我的全名,而不只是我的姓氏,所以我开始修改它。现在,尽管我输入名称以获得“找到的名称为:”结果,但我仍无法弄清楚为什么结果始终为“找不到名称”。 (此外,作业希望将“找不到名称”添加到其他.txt文件中,因此这就是为什么要使用不同的名称。这很好用。)非常感谢!
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main (){
ifstream inFile("/Users/katelynwalker/Documents/CSC450_CT5_mod5.txt");
ofstream outFile;
outFile.open("/Users/katelynwalker/Documents/CSC450_CT5_mod5.txt", ios::app);//appends instead of overwrites
outFile<<"Katelyn Walker";
cout<<"Name has been added to the file. ";
outFile.close();
string search;
cout<<"Please enter a name: ";
cin>>ws;
cin>>search;
bool isFound = 0;
string name = " ";
while(getline(inFile, name)){
for(int i=0; i<search.size(); i++){
if(name[i]==search[i]){
isFound = 1;
}
else{
isFound = 0;
}
}
if(isFound){
cout<<"Name found is: ";
for(int i=search.size()+1;i<name.size();i++)
cout << name[i];
break;
}
}
if(inFile.eof()&&(!isFound)){
outFile.open("/Users/katelynwalker/Documents/CSC450-not-found_CT5_mod5.txt", ios::app);
outFile<<"Name not found.";
cout<<"Name not found.";
}
inFile.close();
return 0;
}
如果您希望将姓名写在一行上,则应写完整的一行,包括换行符:
outFile<<"Katelyn Walker" << std::endl;
并且在询问要搜索的名称时,std::cin >> search
不允许您输入空格。如果您不需要空格,那没关系,否则您应该使用std::getline(std::cin, search);
与您的问题无关,请不要使用using namespace std;
这是一个坏习惯。
问题是由cin
引起的,它仅使单词到达第一个空格,要使用getline
函数获取整个单词。您应该在名称后添加新行,以保持.txt
的整洁。另外,您不需要逐字符检查或打印字符串char,您可以只使用整个字符串
int main() {
ifstream inFile("/Users/katelynwalker/Documents/CSC450_CT5_mod5.txt");
ofstream outFile;
outFile.open("/Users/katelynwalker/Documents/CSC450_CT5_mod5.txt", ios::app);//appends instead of overwrites
outFile << "Katelyn Walker \n";
cout << "Name has been added to the file. ";
outFile.close();
string search;
cout << "Please enter a name: ";
cin >> ws;
getline(cin, search);
string name = " ";
while (getline(inFile, name)) {
if (name.find(search, 0) != string::npos){ //string::npos just meeans null position so not found
cout << "Name found is: ";
cout << name;
}
}
if (inFile.eof()) {
outFile.open("/Users/katelynwalker/Documents/CSC450-not-found_CT5_mod5.txt", ios::app);
outFile << "Name not found.";
cout << "Name not found.";
}
inFile.close();
return 0;
}