Write the following program. When you have completed the program, submit the source file assign7.cpp and the data file scores.txt as attachments to Assignment 07 in TalonNet.
Each program must include the following as comments at the beginning of your program
name
student number
assignment information
program documentation
Remember to also display a description of the program for the user when it starts running!
This program simulates displaying information and performing statistics for a class. You will dynamically create 2 arrays of the same size. One array will hold student numbers, the second array will hold student exam scores. The information for the 2 arrays will come from a file called scores.txt. [ click here to view data file ] This file has information for 1000 students. Save the file to your computer for use by your program. Prompt the user of the program for the number of students for which information will be read.
Note: On my web site in the Assignments section there is an executable version of this program that you can run to see how the program should work. Here is a link to the program: assign7.exe
You are not required to prompt the user for summary or detailed information. You are also not required to run the program as a loop ( in fact you should avoid this unless you are sure of what you are doing... ).
Create the arrays as integer arrays. Name your program assign7.cpp.
Additional Requirements/Notes:
NO global variables.
You must create FUNCTIONS for sorting and printing the arrays. You may create additional functions as well.
You must dynamically allocate the memory for the two arrays
To dynamically create the arrays, put in a declaration similar to the following: int * number = new int [students];
To delete the array when you are finished, enter: delete [ ] number;
See the section on "Dynamic Allocation of Memory" in chapter 8 for more info on dynamic arrays.
A pointer named number can be used exactly as you would an array called number.
1. Read in student number and exam score from the scores.txt file for as many students as the user specified ( 5-1000 ).
2. Sort the arrays in ascending order based on the Student Number and then print the information ( one screenful at a time ).
3. Prompt the user to continue.
4. Sort the arrays in ascending order based on the Exam Score and then reprint the information ( one screenful at a time ).
5. Calculate the mean, median and standard deviation of the exam scores.
If there are an odd number of exam scores, the median is the value of element n / 2 ( e.g. exam[n/2] )
If there are an even number of exam scores, the median is the average of elements n/2 and n/2-1
(e.g. (exam[n/2-1] + exam[n/2]) / 2.0 ).
6. Print the mean, median and standard deviation.
To calculate the standard deviation, first calculate the sample variance using the following formula:
( n is the number of exam scores ).
( sum of the squares of the exam scores ) - [ ( sum of the exam scores )2 / ( n ) ]
( n - 1 )
7. Calculate The standard deviation. The standard deviation is the square root of the sample variance.