为什么程序会抱怨逗号太多？

Question

Here is my code, I have attached the screenshot of what output Zybooks expects, and what my output is. I am trying to get it to output exactly what Zybooks is asking, however something seams to be wrong. It is compiling though. Or maybe Zybooks is just being stupid?

#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <iomanip>
#include <cstring>

using namespace std;

int main() {

    string title;
    string col1;
    string col2;
    string val;
    int numCommas = 0;
    vector<string> stringData;
    vector<int> intData;

    cout << "Enter a title for the data:" << endl;
    getline(cin, title);
    cout << "You entered: " << title << endl << endl;

    cout << "Enter the column 1 header:" << endl;
    getline(cin, col1);
    cout << "You entered: " << col1 << endl << endl;

    cout << "Enter the column 2 header:" << endl;
    getline(cin, col2);
    cout << "You entered: " << col2 << endl << endl;

    while (1) {
        cout << "Enter a data point (-1 to stop input):" << endl;
        getline(cin, val);

        if (val == "-1") {
            break;
        }

        if (val.find(',') == -1) {
            cout << "Error: No comma in string." << endl << endl;
        }
        else {
            for (int i = 0; i < val.length(); i++) {
                if (val.at(i) == ',') {
                    numCommas++;
                    if (numCommas > 1){
                        break;
                    }
                }
            }

            if (numCommas == 1) {
                stringData.push_back(val.substr(0, val.find(',')));
                intData.push_back(stoi(val.substr(val.find(',') + 1, val.length() - 1)));
                cout << "Data string: " << val.substr(0, val.find(',')) << endl;
                cout << "Data integer: " << stoi(val.substr(val.find(',') + 1, val.length() - 1)) << endl;
            }
            else {
                cout << "Error: Too many commas in input." << endl << endl;
            }
        }
    }

    return 0;
}

Thanks.

Thanks.

Answer 1

Your problem is that you initialise numCommas to zero at the start of the program rather than at the start of each author input. That means, once it exceeds one, it will stay that high at least ^(a) , meaning future inputs will always be seen as having too many commas.

You just need to set it to zero immediately before checking each input.

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^(a) Well, until it wraps around (if it wraps around). But that will be an awful lot of commas you need to input :-)