这是我写的代码。当我输入一个小写字符（例如“ a”）时，它给了我一个空白字符，但之后效果很好。你能告诉我我做错了什么吗？谢谢。:)
#include <iostream>
#include <string>
using namespace std;
int main()
{
char letter;
cout << "You will be asked to enter a character.";
cout << "\nIf it is a lowercase character, it will be converted to uppercase.";
cout << "\n\nEnter a character. Press . to stop: ";
cin >> letter;
if(islower(letter))
{
letter = isupper(letter);
cout << letter;
}
while(letter != '.')
{
cout << "\n\nEnter a character. Press . to stop: ";
cin >> letter;
if(islower(letter))
{
letter = toupper(letter);
cout << letter;
}
}
return 0;
}
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