```
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <fstream>
using namespace std;
bool findCurrentNumber (int currentNumber, int foundNumber)
{
if (currentNumber == foundNumber)
{
return true;
}
return false;
}
int main()
{
ifstream inputFile;
inputFile.open("C:\Projects\data.txt");
if (!inputFile)
{
cerr << "Error reading file ";
}
else
{
int searchCurrentNumber;
cout << "Please type in the number you are looking for: ";
cin >> searchCurrentNumber;
bool foundRelevantSection = false;
string delimiter = "energy";
size_t pos = 0;
string token;
string line;
while (getline(inputFile, line))
{
while ((pos = line.find(delimiter)) != string::npos)
{
token = line.substr(0, pos);
//check the found token
//cout << token << endl;
line.erase(0, pos + delimiter.length());
stringstream ss;
//store the whole string into stringstream
ss << token;
string temp;
int found;
while (!ss.eof())
{
//extract the word by word from stream
ss >> temp;
//Check the given word is integer or not
if (stringstream(temp) >> found)
cout << "Number found: " << found << " " << endl;;
//no space at the end of string
temp = "";
}
if (findCurrentNumber (searchCurrentNumber, found) == true)
{
while (getline (inputFile, line))
{
if (foundRelevantSection)
{
//if no matches were found, the function returns "string::npos"
if(line.find("total") != string::npos)
{
//relevant section ends now
foundRelevantSection = false;
}
else
{
cout << line << endl;
}
}
else
{
if (line.find("point") != string::npos )
{
foundRelevantSection = true;
}
}
}
}
else
{
cout << "The number is not equal on this line compared to what is typed in!" << endl;
}
}
} //closes the while-loop
} //closes the if/else-statement
inputFile.close();
return 0;
}
```
大家好
我想解析具有这种格式的输入文件：
point 152 # energy # 0.5 152 152 152 152 152 152 152 152 152 152 152 152 total 0.011 0.049 0.035 point 153 # energy # 1.5 153 153 153 153 153 153 153 153 153 153 153 153 total 0.015 0.050 0.040
代码接受用户提供的整数，并将其与从字符串"点 152 # 能量"中提取的数字进行比较。如果用户输入数字"152"，代码应给出以下数字：
output: 152 152 152 152 152 152 152 152 152 152 152 152
不幸的是，如果输入数字 152 或输入数字 153，我的代码返回完全相反的值。
谁能帮助我，告诉我我做错了什么？我很感激任何提示！
提前感谢！
愿你安好
戴夫·
修复了最后添加的第二个错误。
你应该努力使用调试器变得更好，我发现了你的问题：
while (!ss.eof())
{
//extract the word by word from stream
ss >> temp;
//Check the given word is integer or not
if (stringstream(temp) >> found)
cout << "Number found: " << found << " " << endl;;
//no space at the end of string
temp = "";
}
不会停止在"点 152 #"中找到 152，而是继续处理 #，将找到的变成 0。
此带有中断的代码修复了该部分：
while (!ss.eof())
{
//extract the word by word from stream
ss >> temp;
//Check the given word is integer or not
if (stringstream(temp) >> found)
{
cout << "Number found: " << found << " " << endl;
foundRelevantSection = true;
break; /* exits the while now */
}
//no space at the end of string
temp = "";
}
或者，您可以先将其设置为 0，然后使用&& found == 0
进行测试然后调用findCurrentNumber (int currentNumber, int foundNumber)的部分是垃圾(或更复杂的东西的占位符？(，因为if (findCurrentNumber (searchCurrentNumber, found) == true)只是if (searchCurrentNumber == found)更容易阅读！
我没有检查代码下方是否有更多错误，但是通过中断，您肯定会找到正确的值。
第 2 部分
你已经找到了"点"，所以你不应该再寻找它了！
我在上面的代码中添加了 foundRelevantSection 在中断之前。
将下一部分更改为(如果相关，则否，如果找到点，则无(：
while (getline (inputFile, line) && foundRelevantSection)
{
//if no matches were found, the function returns "string::npos"
if(line.find("total") != string::npos)
{
//relevant section ends now
foundRelevantSection = false;
}
else
{
cout << line << endl;
}
}
希望这是最后一个错误...
我检查了你的代码，虽然不是很简单，但我至少能够理解你想要实现的目标。无论如何，这是我自己对你的问题的贡献。我希望它对您有所帮助，或者至少让您更好地了解解决方案
#include <iostream>
#include <fstream>
#include <regex>
int main()
{
using namespace std;
ifstream inputFile;
inputFile.open("sample.dat");
if (!inputFile)
{
cerr << "Error reading file ";
}
else
{
int searchCurrentNumber;
bool foundRelevantSection = false;
cout << "Please type in the number you are looking for: ";
cin >> searchCurrentNumber;
//while we are still having data to read
std::string currentLine;
while (std::getline(inputFile, currentLine))
{
//remove the top and bottom section of the log
if((currentLine.find("point") == string::npos) && (currentLine.find("total") == string::npos ))
{
//now all the numbers are in the middle then search for the number
size_t pos = currentLine.find(std::to_string(searchCurrentNumber));
if(pos!= string::npos){
//we found the number so we are in the section hopefully
string line;
while (std::getline(inputFile, line))
{
if (foundRelevantSection)
{
//if no matches were found, the function returns "string::npos"
if(line.find("total") != string::npos)
{
//relevant section ends now
foundRelevantSection = false;
}
else
{
cout << line << endl;
}
}
else
{
if (line.find("point") != string::npos )
{
foundRelevantSection = true;
}
}
}
}
}
}
}
return 0;
}