Question

1. 1. Consider the following statements:

   2. 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.

   3. 1. student.course.callNum = "CSC230";
      2. cin >> student.name;
      3. classList[0] = name;
      4. classList[1].gpa = 3.45;
      5. name = classList[15].name;
      6. student.name = name;
      7. cout << classList[10] << endl;
      8. for(int j = 0; j < 100; j++)

   4. classList[j].name = name;

      Assume the declarations of the previous exercise. Write C++ statements that do the following:
      1. Store the following information in course:

   2. name: Programming I

      callNum: 13452

      credits: 3

      grade: ""

   3. 2. In the array classList, initialize each gpa to 0.0.
      3. Copy the information of the thirty-first component of the array classList into student.
      4. Update the gpa of the tenth student in the array classList by adding 0.75 to its previous value.

Answer 1

A.

a. student.course.callNum = "CSC230"; is invalid because callNum is a integer variable so cannot store string data.

b. cin >> student.name; is invalid because we cannot direct access name through student rather we should write student.course.name.name belongs to coursetype structure.

c. classList[0] = name; is invalid because it has no meaning.we can write like classList[0].name.first/last=" *****";

d. classList[1].gpa = 3.45; is valid.

e. name = classList[15].name; it is invalid because we cannot name = some thing rather we should write name.any member of name=something.

f. student.name = name; it is invalid because we are assigning value to a member through a variable of that structure and not to the direct variable.

g. cout << classList[10] << endl; it is invalid because cout statement will print which member of classList[10] is not specified

h. for(int j = 0; j < 100; j++)

classList[j].name = name; it is invalid because again there is no member is specified for name variable of name type structure to assign a value. classList[j].name.?

B.

a.

1. Assume the declarations of the previous exercise. Write C++ statements that do the following:
   1. Store the following information in
   2. course name: Programming I

2. callNum: 13452

   credits: 3

   grade: ""

answer. student.course.name="prog";
student.course.callNum=222;
student.course.credits=3;
student.course.grade=' ';

b. In the array classList, initialize each gpa to 0.0.

   answer. for(int j = 0; j < 100; j++)
classList[j].gpa =0;

c. Copy the information of the thirty-first component of the array classList into student.

answer. student.gpa=classList[31].gpa;

d. Update the gpa of the tenth student in the array classList by adding 0.75 to its previous value.

answer. classList[10].gpa = classList[10].gpa +0.75 ;