[問題] string加法的問題
ex1:
string a = "abc";
string b = "def";
string c = a+b; //報錯
ex2:
string a = "abc";
string b = "def";
a += b;
cout << a; // abcdef
問題:
為什麼ex1會報錯呢... 我怎麼看這兩個都是一樣的例子呀...
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