Question

我有一个array，其中包含不同时间的教室数据和不同的氧气读数。因此，用户必须输入特定的教室和时间，我的程序将打印出当时教室的氧气读数。但是，我有error，我无法将string array与string进行比较。有人能帮帮我吗？

cout << "Please enter the classroom: ";
string classroom;
cin >> classroom;
cout << "Please enter the time: ";
string time;
cin >> time;
cout << endl;

string myData[6][13] = {
    { "EN10-5-56" , "500", "700", "2000", "1850", "2000", "800", "750", "2300", "1900", "1600", "750", "700" },
    { "EN10-5-65" , "550", "1600", "1700", "780", "1980", "700", "750", "2300", "780", "800", "650", "550" },
    { "EN14-5-83" , "600", "700", "2000", "1850", "2000", " 600", "650", "700", "200", "800", "750", "700" },
    { "EN14-5-69" , "900", "600", "1950", "780", "800", "590", "620", "760", "1900", "1890", "2000", "700" },
    { "EN18-5-112", "550", "1670", "2000" , "680", "900", "1500", "1800", "2500", "779", "800", "650", "650" },
    { "EN18-5-118", "800", "1890", "2300", "1850", "2000", "800", "750", "1700", "560", "1300", "1500", "850" },
}; // row x column (class x time)


// row x column
for (int i = 0; i < 6; i++) // classrooms (row)
{
    for (int j = 0; j < 13; j++)
    {
        if (myData[i] == classroom) // ERROR HERE
        {
            cout << myData[i] << endl;
        }
    }
}

错误是：

错误C2679二进制＆＃39; ==＆＃39;：找不到带有＆＃39; std :: string＆＃39;类型的右手操作数的运算符（或者没有可接受的转换），（myData [i] ==教室）。

我如何找到使用输入时间来获取读数？有什么想法??

Answer 1

myData是一个二维数组，但您只提供一个维度说明符。

myData[i]将为您提供array-of-string，而不是单个string实例。您使用i作为列，因此您还必须为该行提供j。

if( myData[i][j] == classroom ) {
    cout << myData[i][j] << endl;
}

Answer 2

它是一个2D矩阵。您无法将其元素作为myData[i]访问。你必须给两个索引。将myData[i]替换为myData[i][0]，并将其与classroom进行比较。如果条件允许，请将myData[i]替换为myData[i][j]。

现在应该可以了。

Answer 3

myData不是1-dimensional array，而是2-dimensional array。

所以，你必须这样做：

cout << "Please enter the classroom: ";
string classroom;
cin >> classroom;
cout << "Please enter the time: ";
string time;
cin >> time;
cout << endl;

string myData[6][13] = {
        { "EN10-5-56" , "500", "700", "2000", "1850", "2000", "800", "750", "2300", "1900", "1600", "750", "700" },
        { "EN10-5-65" , "550", "1600", "1700", "780", "1980", "700", "750", "2300", "780", "800", "650", "550" },
        { "EN14-5-83" , "600", "700", "2000", "1850", "2000", " 600", "650", "700", "200", "800", "750", "700" },
        { "EN14-5-69" , "900", "600", "1950", "780", "800", "590", "620", "760", "1900", "1890", "2000", "700" },
        { "EN18-5-112", "550", "1670", "2000" , "680", "900", "1500", "1800", "2500", "779", "800", "650", "650" },
        { "EN18-5-118", "800", "1890", "2300", "1850", "2000", "800", "750", "1700", "560", "1300", "1500", "850" },
}; // row x column (class x time)


// row x column
for (int i = 0; i < 6; i++) // classrooms (row)
{
    for (int j = 0; j < 13; j++)
    {
        if (myData[i][j] == classroom) // NO ERROR HERE
        {
            cout << myData[i] << endl;
        }
    }
}

如何将字符串与字符串数组中的元素进行比较？

3 个答案: