Storage Classes
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std::strings
Initializing a string
string str = “C++”; // CORRECT
string str1(“C++”); // CORRECT
string str2 (“this is cpp”); // CORRECT
string str3 (ptr); // CORRECT
string str4 = ‘C’; // WRONG
string str5 (1, ‘C’); // CORRECT
string str6 (str); // CORRECT
string str1(“C++”); // CORRECT
string str2 (“this is cpp”); // CORRECT
string str3 (ptr); // CORRECT
string str4 = ‘C’; // WRONG
string str5 (1, ‘C’); // CORRECT
string str6 (str); // CORRECT
Resizing a string
Using the member function ‘resize’ to resize a string will add null characters, ‘\0’ to attain the required size.
string str = “cpp”;
str.resize (10); // str = “cpp\0\0\0\0\0\0\0”;
str.resize (10); // str = “cpp\0\0\0\0\0\0\0”;
Concatenating a string
string str = “C++”;
string str1(“ is incredible”);
char *str2 = “ is incredible”;
char *str3 = “ and challenging.”;
string str += str1; // str = C++ is incredible
string str += str2; // str = C++ is incredible
string str = str + str2 + str3; // Error. Cannot concatenate strings str2 and str3, they being character strings.
string str = str + str2;
str += str3; // str = C++ is incredible and challenging.
string str.append(str1); // str = C++ is incredible
string str1(“ is incredible”);
char *str2 = “ is incredible”;
char *str3 = “ and challenging.”;
string str += str1; // str = C++ is incredible
string str += str2; // str = C++ is incredible
string str = str + str2 + str3; // Error. Cannot concatenate strings str2 and str3, they being character strings.
string str = str + str2;
str += str3; // str = C++ is incredible and challenging.
string str.append(str1); // str = C++ is incredible
