C++ 成员函数的无效使用（您是否忘记了“()”？）
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C++ Invalid use Of Member Function (Did You Forget The '()'?)
提问by Steven O'Riordan
I'm having trouble getting my program to compile. The error is happening on line 165-177. All I added was the test for the presence of letters and I got an error, hope you can help! Full Code http://pastebin.com/embed.php?i=WHrSasYk
我在编译我的程序时遇到问题。错误发生在第 165-177 行。我添加的只是字母存在的测试，我得到了一个错误，希望你能帮助！完整代码http://pastebin.com/embed.php?i=WHrSasYk
(Attached below is code)
（下面附上代码）
do
{
cout << "\nCustomer Details:";
cout << "\n\tCustomer Name:";
cout << "\n\t\tFirst Name:";
getline (cin, Cust_FName, '\n');
if (Quotation::Cust_FName.length() <= 1)
ValidCustDetails = false;
else
{
// Error line 165!
for (unsigned short i = 0; i <= Cust_FName.length; i++)
if (!isalpha(Quotation::Cust_FName.at(i)))
ValidCustDetails = false;
}
cin.ignore();
cout << "\t\tLast Name:";
getline (cin, Cust_LName, '\n');
if (Cust_LName.length () <= 1)
ValidCustDetails = false;
else
{
// Error line 177!
for (unsigned short i = 0; i <= Cust_LName.length; i++)
if (!isalpha(Cust_LName.at(i)))
ValidCustDetails = false;
}
cin.ignore();
}
while(!ValidCustDetails);
回答by cdhowie
These lines are your problem:
这些行是你的问题：
for (unsigned short i = 0; i <= Cust_FName.length; i++)
for (unsigned short i = 0; i <= Cust_LName.length; i++)
// ^^
std::string::lengthis a function, so you need to invoke it with parens:
std::string::length是一个函数，所以你需要用括号调用它：
for (unsigned short i = 0; i <= Cust_FName.length(); i++)
for (unsigned short i = 0; i <= Cust_LName.length(); i++)
回答by Jarod42
I suspect that Cust_LNameis a std::stringso you should add ()after length:
我怀疑这Cust_LName是一个std::string所以你应该在()后面添加length：
Cust_LName.length()
