C++ || Input/Output Text File Manipulation – Find Highest, Lowest, Average & Total Sum

January 06, 2012 admin No comments

This is a program which will utilize fstream, specifically ifstream and ofstream, to read in data from one .txt file, and it will then output selected data into an entirely new separate .txt file.

The input data file has 8 different rows, with each row containing 7 numbers on each line. The program will take in each line one at a time, manipulating the 7 numbers to receive the desired output. This program will find the highest/lowest number in each selected line, along with the total sum of all the numbers contained in that line, and the average of all the numbers. So at the end of the program, There will be 8 different sets of data compiled for each row, with the output file looking like this:

SAMPLE RUN:
- Input File - 3 5 7 3 4 5 6
- Output File - The dataset for input line #1 is: 3 5 7 3 4 5 6 The highest number is: 7 The lowest number is: 3 The total of the numbers is: 33 The average of the numbers is: 4.71

The data file that is used in this example can be downloaded here

Note: In order to read in the data .txt file, you need to save the .txt file in the same directory (or folder) as your .cpp file is saved in. If you are using Visual C++, this directory will be located in

Documents > Visual Studio > Projects > [Your project name] > [Your project name]

NOTE: On some compilers, you may have to add #include < cstdlib> in order for the code to compile.





		
		
			Text File Manipulation
			
C++
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Jan 6, 2012
//    Taken From: http://programmingnotes.org/
//    File:  fileInput.cpp
//    Description: Demonstrates how to read and write data to a file
// ============================================================================
#include <iostream>
#include <fstream>
using namespace std;

int main ()
{   // declare variables
    ifstream infile;
    ofstream outfile;
    int inputNumber = 0;
    int highestNum = -999999;
    int lowestNum = 999999;
    double sum = 0;
    double average = 0;
    int currentLineNum = 1;     
     
    // This opens the input file
    infile.open("INPUT_programmingnotes_freeweq_com.txt");
    if(infile.fail()) //there was an error on open, file not found
    {
        cout << "Cannot find input file, press enter to terminate program." << endl;
        exit (1); // there was an error, program exits
    }

    // This opens the output file
    outfile.open("OUTPUT_programmingnotes_freeweq_com.txt", ios::app);
    if(outfile.fail())
    {
        cout <<"There was an error opening the output file, press enter to terminate program.";
        exit(1); // there was an error, program exits
    }

    do {
        cout << "The dataset for input line #" << currentLineNum << " is: ";
        outfile << "The dataset for input line #" << currentLineNum << " is: ";

        // loops thru file until we get to the last number 
        // from the selected line 
        // (theres 7 numbers total in each line, see input file for clarification)
        for(int counter = 1; counter <= 7; counter++)
        {   
            infile >> inputNumber;

            sum += inputNumber;  // calculates the total sum of #'s for each line

            // checks to see which number is highest/lowest from 
            // each selected line
            if(inputNumber > highestNum)
            {
                highestNum = inputNumber;
            }

            if(inputNumber < lowestNum)
            {
                lowestNum = inputNumber;
            }

            // displays current number to output screen
            // and saves to file
            cout << inputNumber << "\t";
            outfile << inputNumber << "\t";
        }// end for loop

        average = sum / 7; // finds the total avg for each line

        // this displays data to the output screen
        cout << endl;
        cout << "The highest number is: " << highestNum << endl;
        cout << "The lowest number is: " << lowestNum << endl;
        cout << "The total of the numbers is: " << sum << endl;
        cout << "The average of the numbers is: " << average << endl;

        // outfile section here, saves data to file
        outfile << endl;
        outfile << "The highest number is: " << highestNum << endl;
        outfile << "The lowest number is: " << lowestNum << endl;
        outfile << "The total of the numbers is: " << sum << endl;
        outfile << "The average of the numbers is: " << average << endl << endl;
        // outfile section end

        // resets variables back to default values
        highestNum = -999999;
        lowestNum = 999999;
        sum = 0;
        average = 0;
        currentLineNum++;

        // places data on new line
        cout << endl << endl;    

    } while(!infile.eof()); // loop stops once it reaches the end of file
    
    cout << endl << endl <<"\tWe have reached the end of the file!"<< endl;
    outfile << endl << endl <<"\tWe have reached the end of the file!"<< endl << endl;
    outfile.close();  // closes outfile
    infile.close();        // closes infile

    return 0;
}// http://programmingnotes.org/
			
				
					
				
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						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Jan 6, 2012
//    Taken From: http://programmingnotes.org/
//    File:  fileInput.cpp
//    Description: Demonstrates how to read and write data to a file
// ============================================================================
#include <iostream>
#include <fstream>
using namespace std;
 
int main ()
{   // declare variables
    ifstream infile;
    ofstream outfile;
    int inputNumber = 0;
    int highestNum = -999999;
    int lowestNum = 999999;
    double sum = 0;
    double average = 0;
    int currentLineNum = 1;     
     
    // This opens the input file
    infile.open("INPUT_programmingnotes_freeweq_com.txt");
    if(infile.fail()) //there was an error on open, file not found
    {
        cout << "Cannot find input file, press enter to terminate program." << endl;
        exit (1); // there was an error, program exits
    }
 
    // This opens the output file
    outfile.open("OUTPUT_programmingnotes_freeweq_com.txt", ios::app);
    if(outfile.fail())
    {
        cout <<"There was an error opening the output file, press enter to terminate program.";
        exit(1); // there was an error, program exits
    }
 
    do {
        cout << "The dataset for input line #" << currentLineNum << " is: ";
        outfile << "The dataset for input line #" << currentLineNum << " is: ";
 
        // loops thru file until we get to the last number 
        // from the selected line 
        // (theres 7 numbers total in each line, see input file for clarification)
        for(int counter = 1; counter <= 7; counter++)
        {   
            infile >> inputNumber;
 
            sum += inputNumber;  // calculates the total sum of #'s for each line
 
            // checks to see which number is highest/lowest from 
            // each selected line
            if(inputNumber > highestNum)
            {
                highestNum = inputNumber;
            }
 
            if(inputNumber < lowestNum)
            {
                lowestNum = inputNumber;
            }
 
            // displays current number to output screen
            // and saves to file
            cout << inputNumber << "\t";
            outfile << inputNumber << "\t";
        }// end for loop
 
        average = sum / 7; // finds the total avg for each line
 
        // this displays data to the output screen
        cout << endl;
        cout << "The highest number is: " << highestNum << endl;
        cout << "The lowest number is: " << lowestNum << endl;
        cout << "The total of the numbers is: " << sum << endl;
        cout << "The average of the numbers is: " << average << endl;
 
        // outfile section here, saves data to file
        outfile << endl;
        outfile << "The highest number is: " << highestNum << endl;
        outfile << "The lowest number is: " << lowestNum << endl;
        outfile << "The total of the numbers is: " << sum << endl;
        outfile << "The average of the numbers is: " << average << endl << endl;
        // outfile section end
 
        // resets variables back to default values
        highestNum = -999999;
        lowestNum = 999999;
        sum = 0;
        average = 0;
        currentLineNum++;
 
        // places data on new line
        cout << endl << endl;    
 
    } while(!infile.eof()); // loop stops once it reaches the end of file
    
    cout << endl << endl <<"\tWe have reached the end of the file!"<< endl;
    outfile << endl << endl <<"\tWe have reached the end of the file!"<< endl << endl;
    outfile.close();  // closes outfile
    infile.close();        // closes infile
 
    return 0;
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

LOOPS
This program utilizes one do/while loop on lines 39-97 which loops thru the input file until it reaches the end of the file. This program also uses a for loop, which is noted on line 46.

CALCULATING THE SUM
Line 50 contains the assignment operator “+=“, which will calculate a running total for all the values of each selected line.

READING IN DATA FROM FILE
This is noted in line 48, and works just like a cin statement.

OPENING FILES
File declarations, and the opening of files are highlighted on lines: 14-15, 24-25, 32-33. On line 32, the term “ios::app” means the file will append new data to the text file, instead of overwriting the old data contained within that file.

OUTPUT DATA TO FILE
This is highlighted on lines 80-84, and as you can see, the output statements are exactly the same as cout statements.

CLOSE FILES
Remember to close the files you open, as highlighted on lines 101 and 102.

Once compiling the above code, you should receive this as your output (for the 8 selected lines contained within the input text file)

The dataset for input line #1 is: 346 130 982 90 656 117 595 The highest number is: 982 The lowest number is: 90 The total of the numbers is: 2916 The average of the numbers is: 416.571
The dataset for input line #2 is: 415 948 126 4 558 571 87 The highest number is: 948 The lowest number is: 4 The total of the numbers is: 2709 The average of the numbers is: 387 The dataset for input line #3 is: 42 360 412 721 463 47 119 The highest number is: 721 The lowest number is: 42 The total of the numbers is: 2164 The average of the numbers is: 309.143 The dataset for input line #4 is: 441 190 985 214 509 2 571 The highest number is: 985 The lowest number is: 2 The total of the numbers is: 2912 The average of the numbers is: 416 The dataset for input line #5 is: 77 81 681 651 995 93 74 The highest number is: 995 The lowest number is: 74 The total of the numbers is: 2652 The average of the numbers is: 378.857 The dataset for input line #6 is: 310 9 995 561 92 14 288 The highest number is: 995 The lowest number is: 9 The total of the numbers is: 2269 The average of the numbers is: 324.143 The dataset for input line #7 is: 466 664 892 8 766 34 639 The highest number is: 892 The lowest number is: 8 The total of the numbers is: 3469 The average of the numbers is: 495.571 The dataset for input line #8 is: 151 64 98 813 67 834 369 The highest number is: 834 The lowest number is: 64 The total of the numbers is: 2396 The average of the numbers is: 342.286
We have reached the end of the file!

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Posted in: Advanced, C++ Tags: Average, c++, File, highest, input, Lowest, Output, Sum, Text, text file, Total

C++ || Input/Output Text File Manipulation – Find Highest, Lowest, Average & Total Sum

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