Question

在一个简短的基本测试C ++程序中，我使if，else if和else语句似乎不起作用。无论你输入if是什么答案，否则if和else语句只是自动跳转到else语句而我不明白为什么。我已经尝试了许多不同类型的方法来删除此错误，但似乎没有任何方法

#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

int main()
{
string name;
string feeling;
int age;

//IMPORTANT MESSAGE
cout << "THIS PROGRAM IS CAPS/SLANG SENSITIVE!" << endl << endl;
//IMPORTANT MESSAGE

cout << "Hello User, please enter name: ";
cin >> name;
cout << endl << endl;

cout << "Now please enter your age: ";
cin >> age;
cout << endl << endl;

cout << "Hello " << name << ", you are " << age << " years old." << endl << endl;
system("pause");
cout << endl;

cout << "How are you today " << name << "?: ";
cin >> feeling;
cout << endl << endl;

if (feeling == "Good")
cout << "That's great!";

else if (feeling == "Okay")
cout << "Fair enough.";

else;
cout << "Well to be fair I don't care so good day :)." << endl << endl;

cin.get();
return 0;

}

Answer 1

这是因为;之后的else：

else;

过早结束陈述，因此下一行与if条件无关。

你应养成在if块周围放置花括号的习惯：

if (feeling == "Good") {
  cout << "That's great!";
} else if (feeling == "Okay") {
  cout << "Fair enough.";
} else {
  cout << "Well to be fair I don't care so good day :)." << endl << endl;
}

Answer 2

在else之后删除分号。

Answer 3

您在;

之后添加了分号else

删除那样的写作：

else
    cout << "Well to be fair I don't care so good day :)." << endl << endl;

此外，您可以使用支架轻松理解..

C ++ if，else if和else语句问题

3 个答案: