Cho 2câu sau s1='Ha Noi' s2='Viet Nam' hãy thực hiện S1+s1
Insert (s1,s2,1)
Insert (s2,s1,4)
Delete(s2,1,6)
Delete (2,6,4)
Copy (s1,1,5)
Copy (s2,7,2)
Pos ('ie',s2)
Pos ('a',s1)
Length (s2)

Consider the following statements: struct nametype{string first; string last; }; struct coursetype{string name; int callnum; int credits; char grade; }; struct studenttype{nametype name; double gpa; coursetype course; }; studenttype student; studenttype classlist[100]; coursetype course; nametype name; mark the following statements as valid or invalid. if a statement is invalid, explain why. a.) student. course. callnum = "csc230"; b.) cin > > student. name; c.) classlist[0] = name; d.) classlist[1].gpa = 3.45; e.) name = classlist[15].name; f.) student. name = name; g.) cout < < classlist[10] < < endl; h.) for (int j = 0; j < 100; j++)classlist[j].name = name; i.) classlist. course. credits = 3; j.) course = studenttype. course;