CS 1440 Lab 7
· To define a struct
· To use structs in various C++ expressions
Examine the following C++ program that defines and
uses the Student struct described in the prelab.
1. How the struct is defined,
2. Where the struct is defined,
3. How the struct variables are used
a. as function parameters
b. in I/O statements
c. in arithmetic expressions.
using namespace std;
/* struct definition BEFORE any use of Student */
double test1, test2, test3;
/* Now we can use the Student data type */
void get_info(Student &s);
void print_info(Student s);
Student student1, student2;
cout << "Which student info do you wish to see?"
<< " (1 or 2): ";
cin >> s;
} while ( ! (s==1 || s==2));
if (s == 1) print_info(student1);
void get_info(Student & s) /* Notice reference parameter!! */
cout << "Enter student's name: ";
cout << "Enter 3 test scores: ";
cin >> s.test1 >> s.test2 >> s.test3;
s.average = (s.test1 + s.test2 + s.test3) / 3;
cout << "Enter final grade (no spaces): ";
cin >> s.grade;
cin.get(newline); /* left over from cin >> above */
void print_info(Student s)
cout << "Student: " << s.name << endl;
cout << "\tGrade: " << s.grade << endl;
cout << "\tTests: " << endl;
cout << "\t\tAverage: " << s.average << endl;
cout << "\t\tScores: "
<< s.test1 << ","
<< s.test2 << ","
<< s.test3 << endl;
Make a Lab7 directory in your 1440 directory.
Cut and paste the above program into a file named struct.C in your Lab7 directory.
Modify the program so that the struct has an additional data member to hold the student's ID number. The ID number "looks like" a social security number (123-45-6789). Since the ID contains both digits and hyphens, it should be a string. Change the get_info() function so that it asks for and gets the ID number right after it gets tha name. Make suitable changes to print_info() so that the ID number appears in the output in an appropriate place with an appropriate label.