Question

我无法使用END的bool值来停止运行循环（下面的代码）。程序的其余部分可以工作，但是当我输入end时，我似乎无法停止循环。有什么建议吗？

bool END = false;
while (!END)
{
    cout << "Please enter a song or END to terminate: ";
    getline(cin, track);

    results = binarySearch(tracks, numTracks, track);

    if (results == -1)
        cout << track << " is not on the set list.\n";
    else if (results != -1)
    {
        cout << track << " is on the set list.\n";
    }
}

Answer 1

if ( track == "END" )
     break;// or whatever you want to happen, e.g. END = true

您需要检查用户输入。

Answer 2

实际上，没有必要使用带有bool变量的while循环作为条件。您可以通过以下方式重写循环

while ( true )
{
    cout << "Please enter a song or END to terminate: ";

    if ( !getline( cin, track ) || track == "END" ) break;

    results = binarySearch(tracks, numTracks, track);

    if ( results == -1 )
    {
        cout << track << " is not on the set list.\n";
    }
    else
    {
        cout << track << " is on the set list.\n";
    }
}

还要注意if-else语句的else部分。

如何使用bool sentinel值来结束C ++中的while循环？

2 个答案: