Codes on structures
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1. The document describes a C++ program that defines a student structure with fields like ID, name, grade, etc. It declares variables of this structure type, initializes them, and passes them to a display function to output the student records in a formatted table. 2. It also shows another C++ program that defines a student grades structure, includes functions to get student data input, calculate average grade, assign a letter grade, and print the results. The main function uses a do-while loop to repeatedly get, process, and display data for multiple students by passing the structure between functions.
![1.
#include <iostream.h>
#include <conio.h>
#include <iomanip.h>
struct student
{
int ID; // 4 bytes
char name[10];//10bytes
float grade; // 4bytes
int age; // 4
char phone[10]; // 10
char e_mail[16]; // 16
};
void display(struct student s)
{
cout<<setw(3)<< s.ID <<setw(12)<< s.name <<setw(8)<< setiosflags (ios::showpoint)<<setprecision(2)<<
s.grade<<setw(5)<<s.age <<setw(10)<< s.phone<< setw(18)<<s.e_mail<<endl;
}
void main()
{
struct student s1={55,"Amir Ali",3.5f,23,"6535418","amir@yahoo.com"};
struct student s2={26,"Mujahid",2.9888f,25,"5362169", "muj@hotmail.com"};
struct student s3={39,"M Jamil",3.108f,30,"2345677","jam@hotmail.com"};
struct student s4={44,"Dilawar",2.7866f,31,"5432186","dil@hotmail.com"};
struct student s5={59,"S.Naveed",2.9f,27,"2345671","navee@yahoo.com"};
cout<<" Students Records Sheetn";
cout<<" ~~~~~~~~~~~~~~~~~~~~~~nn";
cout<<"ID# NAME GRADE AGE PHONE E-MAILn";
cout<<"~~~ ~~~~ ~~~~~ ~~~ ~~~~~ ~~~~~~~n";
display(s1); // structure pass to function
display(s2); // structure pass to function
display(s3);
display(s4);
display(s5);
}
2.
// In this program you will see the structures (members Manipulation),
// Passing structures to functions:
#include <iostream.h>
#include <iomanip.h>
struct S_Details
{
char name [30];](https://image.slidesharecdn.com/codesonstructures-140524224748-phpapp01/85/Codes-on-structures-1-320.jpg)
Codes on structures
- 1. 1. #include <iostream.h> #include <conio.h> #include <iomanip.h> struct student { int ID; // 4 bytes char name[10];//10bytes float grade; // 4bytes int age; // 4 char phone[10]; // 10 char e_mail[16]; // 16 }; void display(struct student s) { cout<<setw(3)<< s.ID <<setw(12)<< s.name <<setw(8)<< setiosflags (ios::showpoint)<<setprecision(2)<< s.grade<<setw(5)<<s.age <<setw(10)<< s.phone<< setw(18)<<s.e_mail<<endl; } void main() { struct student s1={55,"Amir Ali",3.5f,23,"6535418","amir@yahoo.com"}; struct student s2={26,"Mujahid",2.9888f,25,"5362169", "muj@hotmail.com"}; struct student s3={39,"M Jamil",3.108f,30,"2345677","jam@hotmail.com"}; struct student s4={44,"Dilawar",2.7866f,31,"5432186","dil@hotmail.com"}; struct student s5={59,"S.Naveed",2.9f,27,"2345671","navee@yahoo.com"}; cout<<" Students Records Sheetn"; cout<<" ~~~~~~~~~~~~~~~~~~~~~~nn"; cout<<"ID# NAME GRADE AGE PHONE E-MAILn"; cout<<"~~~ ~~~~ ~~~~~ ~~~ ~~~~~ ~~~~~~~n"; display(s1); // structure pass to function display(s2); // structure pass to function display(s3); display(s4); display(s5); } 2. // In this program you will see the structures (members Manipulation), // Passing structures to functions: #include <iostream.h> #include <iomanip.h> struct S_Details { char name [30];
- 2. int exam1; int exam2; int exam3; int final; float sem_ave; char letter_grade; }; //inputs the data items for a student, structure //is passed by reference struct S_Details get_stu ( ) { struct STU_GRADES student; cout << "nnnn Enter the information for a studentn"; cout << " Name: "; cin.getline (student.name, 30, 'n'); cout << " Exam1: "; cin >> student.exam1; cout << " Exam2: "; cin >> student.exam2; cout << "exam3: "; cin >> student.exam3; cout << "final: "; cin >> student.final; return student; } //displays a student's info. //structure is passed by value void print_stu (struct STU_GRADES stu) { cout << "nnnGrade report for: " << stu.name<<endl; cout << "nexam 1texam 2texam 3tfinaln"; cout << stu.exam1 << "t" << stu.exam2 << "t"<< stu.exam3 << "t" << stu.final; cout << "nnnsemester average: " << setiosflags (ios::fixed)<< setprecision (2) << stu.sem_ave; cout << "nsemester grade: " << stu.letter_grade; } float calc_ave (int ex1, int ex2, int ex3, int final) { float ave; ave = float (ex1 + ex2 + ex3 + final)/4.0f; return ave; } char assign_let (float average) {
- 3. char let_grade; if (average >=90) let_grade = 'A'; else if (average >= 80) let_grade = 'B'; else if (average >= 70) let_grade = 'C'; else if (average >= 60) let_grade = 'D'; else let_grade = 'F'; return let_grade; } int main() { struct S_Details stu; char more; do { //pass the entire structure Stu = get_stu ( ); //pass elements of the strucutre stu.sem_ave = calc_ave (stu.exam1, stu.exam2, stu.exam3, stu.final); //pass elements of the structure stu.letter_grade = assign_let (stu.sem_ave); //pass the entire structure print_stu (stu); cout << "nnn Enter another student? (y/n) "; cin >> more; //grab the carriage return since //character data is input next cin.ignore ( ); } while (more == 'y' || more == 'Y'); return 0; }