Question

我正在尝试取出firstName字符串，但是我得到了非常奇怪的输出。

示例数据： 75428马斯顿，爱德华

通缉输出：马斯顿爱德华75428

输出接收：马斯顿，爱德华75428

代码：

ifstream textFile("NameZip.txt");//File initializer

int counter = 0; //Used to cycle data into struct[] implementData. Avoiding a longer more memory hungry alternative since we know the file is going to be 20 lines long
int tmpZip;
string tmpString;

personData implementData[20];//creates object for structure

if(textFile.is_open())//checks to make sure file exists in same folder to avoid errors
{while(getline(textFile,tmpString))
{
    stringstream convert(tmpString.substr(0,6));
    convert >> tmpZip; //pulls out the Zipcode
    string firstName = tmpString.substr(tmpString.find(" ") +1,tmpString.find(","));//pulls out the first name
    string lastName = tmpString.substr(tmpString.find(",")+2); //pulls out last name
    implementData[counter++] = {tmpZip,firstName,lastName}; //sets value for that tab in the structure personData

}}else
    cout << "There was a problem reading from the textFile\nPlease make sure the file is in the same folder as the .cpp program" << endl;
printData(implementData);
return 0;

不仅仅是这一个数据，First Name的所有数据似乎都停在第13个字符而不是停在逗号处。我错误地拆分了数据吗？

Answer 1

使用助推精神：

{{1}}

Answer 2

提取名字时出错。您正在使用：

string firstName = tmpString.substr(tmpString.find(" ") +1,tmpString.find(","));

第二个论点不正确。第二个参数是计数 - 要提取的字符数。它并不意味着最终立场。请参阅the documentation。

将该行更改为：

auto start = tmpString.find(" ") + 1;
auto end = tmpString.find(",");
string firstName = tmpString.substr(start, (end-start));

c ++中find（）命令的问题

2 个答案: