查找字符串的第一个字符，然后将其与符号 c++ 进行比较

Question

Attempting to check the first character of a string to see if it contains a "/".

string pathname = "/test";
if(pathname.at(0) == "/")
{
    // if first character is a slash then delete the slash
    // but only delete the slash if it's the first character
    pathname.erase(pathname.begin()+0);
}

I understand that the above code will not work because pathname.at(0) is considered an int.

I'm sure this has been asked before. But I have looked around a lot. I've seen the substr method the find method and many others. I can't seem to get them working right though.

Suggestions? Thanks in advance.

Answer 1

Use single quote for character constant.

if(pathname.at(0) == '/')
                     ^ ^

Double quotes, no matter how many characters are inside, represents a C-style string . You can't compare a character to a C-string.

Answer 2

You compare the first symbol code with a pointer to string. Try to compare the first symbol with the char.

if(pathname.at(0) == '/')