Problem in strings(cpp)

string tmp=“abc”
string f;
why f gives a empty string can anyone explain

string tmp= “abc”;
string f;
cout << f;

Use f+=tmp[0] which means f = f+tmp[0] instead

what is wrong in
this means f is assigned a string which contains first char in tmp.

even f=“a”+tmp[0];
is giving empty string

If it is only for assigning f to the first char then consider using f=tmp[0]; instead

f=""+tmp[0]; what is wrong in this I just cast a char to string using “”

The problem is you cannot directly add char (i.e temp[0]) to a string like that you will get a warning but your code will run.

adding ‘std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator>::value_type’ (aka ‘char’) to a string does not append to the string [-Wstring-plus-int]

Solution -

Assign “” to a string variable and things should work just fine.

string tmp=“abc”;
string f;
string b="";

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