SC has not a built in string class. It uses just null terminated c++ strings (const char *). The reason is that every project has usually own class and it is more desirable to use it instead some built in one. There is an alias defined for const char* - PCStr. Two strings (not variables) are joined by putting them together - see an example below.
PCStr s1 = "string 1"; PCStr s2 = "string 1 " "string 2" // concatenating strings.
A string cannot contain character of ASCII code less than 32. If you need pass such a character, use a following sequence starting with '\' character ('\' character starts an escape sequence so to put it in the string use \\ sequence):