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Calculate following s=n+(n-1)+(n-2)+.....+2+1in c++
R9.3 Write a partial C++ class definition that contains the public interface of the Date class
described in Exercise R9.2. Supply member functions for setting the date to a particular
year, month, and day, for advancing the date by a given number of days, and for finding
the number of days between this date and another. Pay attention to const.
Write a program find that searches all files specified on the command line and prints
out all lines containing a keyword. For example, if you call
find Tim report.txt address.txt homework.cpp
then the program might print
report.txt: discussed the results of my meeting with Tim T
address.txt: Torrey, Tim|11801 Trenton Court|Dallas|TX
address.txt: Walters, Winnie|59 Timothy Circle|Detroit|MI
homework.cpp: Time now;
The keyword is always the first command-line argument.
At a school’s bazaar, activities were divided into ‘stalls’. At the close of the bazaar,
the manager of each stall submitted information to the Principal consisting of the
name of the stall, the income earned and its expenses. Some sample data were:

Games 2300.00 1000.00
Sweets 900.00 1000.00

Using a structure to hold a stall’s data, write a program to read the data and print a
report consisting of stall name and net income (income - expenses), in order of
increasing net income using selection sort. Assume that a line containing xxxxxx only ends the data.
At a school’s bazaar, activities were divided into ‘stalls’. At the close of the bazaar, the manager of each stall submitted information to the Principal consisting of the name of the stall, the income earned and its expenses. Some sample data were:

Games 2300.00 1000.00

Sweets 900.00 1000.00

Using a structure to hold a stall’s data, write a program to read the data and print a report consisting of stall name and net income (income - expenses), in order of increasing net income using selection sort.
At a school’s bazaar, activities were divided into ‘stalls’. At the close of the bazaar,
the manager of each stall submitted information to the Principal consisting of the
name of the stall, the income earned and its expenses. Some sample data were:

Games 2300.00 1000.00
Sweets 900.00 1000.00

Using a structure to hold a stall’s data, write a program to read the data and print a
report consisting of stall name and net income (income - expenses), in order of
increasing net income using selection sort. In addition, print the number of stalls, the total profit or loss of the bazaar and the stall(s) which made the most profit. Stalls which made a profit must be printed in increasing order of profit. Assume that a line containing xxxxxx only ends the data.
(a) A class "Student" has three data members: student_name, enrolment_no, marks of 5 subjects
and member function to assign streams on the basis of the criteria given below: 6
Average Marks Stream
>90% Computer Science
> 80 - 90% Science
>75 - 80% Commerce
>70 - 75% Arts
Below 70% Vocational
Write a C++ program to calculate average marks of each student and display student name,
enrolment no, and their stream.
Implement a class Student. For the purpose of this exercise, a student has a name and a total quiz score. Supply an appropriate constructor and functions get_name(), add_quiz(int score), get_total_score(), and get_average_score(). To compute the latter, you also need to store the number of quizzes that the student took.
A microwave control panel has four buttons: one for increasing the time by 30 seconds, one for switching between power levels 1 and 2, a reset button, and a start button. Implement a class that simulates the microwave, with a member function for each button. The member function for the start button should print a message “Cooking for ... seconds at level ...”.
Define a structure Student with a name and a vector<Course*> of courses. Define a structure Course with a name and a vector<Student*> of enrolled students. Then define these functions:

•void print_student(Student* s) that prints the name of a student and the names of all courses that the student takes.

•void print_course(Course* c) that prints the name of a course and the names of all students in that course.

•void enroll(Student* s, Course* c) that enrolls the given student in the given course, updating both vectors.

In your main function, define several students and courses, and enroll students in the courses. Then call print_student for all students and print_course for all courses.
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