C++ structure membrers

STRUCTURE

• A Structure is a container, it can hold a bunch of things.

–These things can be of any type.

• Structures are used to organize related data (variables) into a nice neat package.

EXAPMES STUDENT RECORD

• Student Record:

–Name   a string
–HW Grades  an array of 3 doubles
–Test Grades  an array of 2 doubles
–Final Average  a double

STRUCTURE MEMBRERS

• Each thing in a structure is called member.
• Each member has a name, a type and a value.
• Names follow the rules for variable names.
• Types can be any defined type.

EXAMPLE STRUCTURE DEFINITION

struct StudentRecord {

  char *name;  // student name
  double hw[3];  // homework grades
  double test[2];  // test grades
  double ave;  // final average

};

USING A STRUCT

• By defining a structure you create a new data type.
• Once a struct is defined, you can create variables of the new type.

StudentRecord stu;

ACCESSING MEMBERS

• You can treat the members of a struct just like variables.
• You need to use the member access operator ‘.’ (pronounced « dot »):

cout << stu.name << endl;

stu.hw[2] = 82.3;

stu.ave = total/100;