using C++ Learning objective: practice more on using IO Streams, arrays, and lea

Question

using C++

Learning objective: practice more on using IO Streams, arrays, and learn to implement algorithms.

Program objective: Write a program that allows the user to calculate statistics in a given input file.

Example usage:stats.exe 1 c:\temp\sample1.csv c:\temp\sample1_stats.csv

2, 2, 2, 2

4, 4, 0, 4

2, 3, 3, 3
Row, Sum, Mean, STD, Median, Mode, Min, Max

1, 8, 2, 0, 2, 2, 2, 2

2, 12, 3, 2, 4, 4, 0, 4

3, 11, 2.75, 0.50, 3, 3, 2, 3

Requirements: • The user can provide the path to any .csv file he/she inputs to the program • The user can write the output .csv file to any location; your program should handling inaccessible paths gracefully. • Use floating point with 2 significant digits. • You must use loop(s) to calculate the statistics. You must not use any built-in functions to calculate any of these statistics. • The argument “1” determines the statistics to write to file: –

1: all statistics (as shown in example above) –

2: calculate and print the mean and STD only

• [New] To get user’s input of filenames, you may use one of the following two approaches:

1. Specify as command line argument

2. Query user via std::cin
2, 2, 2, 2

4, 4, 0, 4

2, 3, 3, 3
Row, Sum, Mean, STD, Median, Mode, Min, Max

1, 8, 2, 0, 2, 2, 2,

2 2, 12, 3, 2, 4, 4, 0, 4

3, 11, 2.75, 0.50, 3, 3, 2, 3 sample1.csv sample1_stats.csv
stats.exe 1 c:\temp\sample1.csv c:\temp\sample1_stats.csv

Also Allow your program to take 2 or more input .csv files, merge the data points of each row, and then calculate the statistics of the merged data • Assumptions: – 2 data files have same number of rows… (what if they don’t? how may you address these problem cases? Hint: use try-catch) • Example usage:

sample1.csv

2, 2, 2, 2

4, 4, 0, 4

2, 3, 3, 3

sample2.csv

2, 2

4, 4

0, 0

integraged_stats.csv

Row, Mean, STD

1, 2, 2,

2, 3.30, 1.63

3, 11, 1.47

Explanation / Answer

inputFile = open("test.txt", "r")

outputFile = open("test2.txt", "a")

outputFile.write("myTotal, myMean, myStd, myMedian, myMode, myMinimum, myMaximum ")

count = 0

for line in inputFile:

count += 1
infileline = line.rstrip().split(",")
infileline.sort()
while line != "":
myTotal = float(infileline[0]) + float(infileline[1]) + float(infileline[2]) + float(infileline[3])
myMean = myTotal / 4
myStd = ((float(infileline[0])**2 + float(infileline[1])**2 + float(infileline[2])**2 + float(infileline[3])**2) / 4) - myMean**2
myMedian = (float(infileline[1]) + float(infileline[2])) / 2
myMode = 2
myMinimum = float(infileline[0])
myMaximum = float(infileline[3])

outputFile.write(str(count)+',')

outputFile.write(','.join("%1.0f"%i for i in (myTotal, myMean, myStd, myMedian, myMode, myMinimum, myMaximum)))

outputFile.write(' ')

inputFile.close()

outputFile.close()

Related Questions

Navigate

• Browse (All)
• Browse U
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.