Question

CODE ERROR

Please help to fix the error. I don't know why I can not output to file. when I open the output file there is an error.

here is the input data:

Princeton University
NJ Princeton
41820    8014   0.0740   0.98   0.97
Harvard University
MA Cambridge
43838    19882   0.0580   0.97   0.97
Yale University
CT New Haven
45800    12109   0.0690   0.99   0.98
Columbia University
NY New York          
51008    23606   0.0690   0.99   0.96
Stanford University
CA Stanford
44757    18136   0.0570   0.98   0.96
University of Chicago
IL Chicago
48253    12539   0.0880   0.99   0.93
Massachusetts Institute of Technology
MA Cambridge
45016    11301   0.0820   0.98   0.93
Duke University
NC Durham
47488    15465   0.1240   0.97   0.94
University of Pennsylvania
PA Philadelphia
47668    21358   0.1220   0.98   0.96

here is my code:

//

// main.cpp

// Resubmit LAB 7

//

// Created by Quoc Le on 12/8/19.

// Copyright © 2019 Quoc Le. All rights reserved.

//

#include <iostream>

#include <fstream>

#include <iomanip>

#include <string>

#include <cstdlib>

#include <sstream>

#define max 1000

using namespace std;

void getData(string[],string[],string[],double[],double[],double[],double[],double[],int&);

void outputFile(ofstream&,string[],string[],double[],double[],double[],double[],int);

int main()

{

//Declare variables

string univerName[max], state[max], city[max];

double tuition[max], enrollment[max], avgFreRetention[max], percentFreshman[max],percentGraduated[max];

int number = 0;

  

ofstream outFile;

outFile.open("outfile.txt");

  

//Input from file

getData(univerName,state,city,tuition,enrollment,avgFreRetention,percentGraduated,percentFreshman,number);

  

//Output

outputFile(outFile,univerName,state,tuition,enrollment,percentFreshman,percentGraduated,number);

outFile.close();

return 0;

}//main

/////////////////////////////

void getData(string univerName[],string state[],string city[],double tuition[],double enrollment[],double avgFreRetention[],double percentGraduated[],double percentFreshman[], int& num)

{

/*

   Pre: univerName[] - array of university name

state[] - array of state

city[] - array of city

tuition[] - array of tuition

enrollment[] - array of enrollment

avgFreRetention[] - array of average freshman retention

percentGraduated[] - array of percentage of student graduated

percentFreshman[] - array of percentage retention for freshman

number - reference to number of universities in study

   Post: nothing

   Purpose: read in universities

   */

ifstream inFile;

inFile.open("universities.txt");

if(inFile.fail() == 1)

{

cout << "No Such File" << endl;

exit(100);

}

string line;

num = 0;

while (!inFile.eof())

{

getline(inFile,univerName[num]);

  

getline(inFile,state[num]);

inFile >> tuition[num] >> enrollment[num] >> avgFreRetention[num] >>percentFreshman[num]>>

   percentGraduated[num];

cout<<"\n University \t\t\t State \t Tuition \t Enrollment \t %Fresh Succeed \t %Graduate in six year" <<endl;

cout<<univerName[num]<<"\t\t\t\t"<<state[num]<<"\n"<<tuition[num]<<"\t"<<enrollment[num]<<"\t"<<percentFreshman[num]<<"%"<<"\t"<<percentGraduated[num]<<"%"<<endl;

  

inFile.ignore(2);

num++;

}

inFile.close();

}//getData

////////////////////////////////////////////////////////////////////////

void outputFile(ofstream& outFile,string univerName[],string state[],double tuition[],double enrollment[],double percentFreshman[],double percentGraduated[],int number)

{

outFile<<"\n University \t\t\t\t State \t Tuition \t Enrollment \t %Fresh Succeed \t %Graduate in six year" <<endl;

  

for(int i=0; i<number; i++)

outFile<< univerName[i]<<"\t\t\t\t"<<state[i]<<"\t"<<tuition<<"\t"<<enrollment<<"\t"<<percentFreshman<<"%"<<"\t"<<percentGraduated<<"%"<<endl;

}//output

Answer 1

Modification In the program

1. In getData() method

During reading line by line “\n” character append to reading line.

i.e   getline(inFile,univerName[num]);

If we will print it on screen, next output will go to next line

Hence we have to remove it by

Suppose we have a string “str” then

str=resize(str.size()-1)

And here

univerName[num].resize(univerName[num].size()-1);

2. in outputFile Mthod

for(int i=0; i<number; i++)

outFile<< univerName[i]<<"\t\t\t\t"<<state[i]<<"\t"<<tuition<<"\t"<<enrollment<<"\t"<<percentFreshman<<"%"<<"\t"<<percentGraduated<<"%"<<endl;

}//output

We can see here "<<tuition<<"\t"<<enrolment

These are array, so index no is omitted, we have to provide the index no for all such array in the for loop. Other wise it will print only base address of the array

Next , instead of “\t” if we will use setw is better. It creates a specific length of a column

So data will visible in perfect column wise.

std::left : for all out statement in left alignment

C++ CODE

#include <iostream>
#include <fstream>
#include <iomanip> // for setw
#include <string>
#include <cstdlib>
#include <sstream>
#define max 1000
using namespace std;

void getData(string[],string[],string[],double[],double[],double[],double[],double[],int&);
void outputFile(ofstream&,string[],string[],double[],double[],double[],double[],int);

int main()
{

   //Declare variables
   string univerName[max], state[max], city[max];
   double tuition[max], enrollment[max], avgFreRetention[max], percentFreshman[max],percentGraduated[max];
   int number = 0;

   ofstream outFile;
   outFile.open("outfile.txt");

   //Input from file

   getData(univerName,state,city,tuition,enrollment,avgFreRetention,percentGraduated,percentFreshman,number);
   //Output

   outputFile(outFile,univerName,state,tuition,enrollment,percentFreshman,percentGraduated,number);
   outFile.close();

   return 0;

}//main end

/////////////////////////////Read from file

void getData(string univerName[],string state[],string city[],double tuition[],double enrollment[],double avgFreRetention[],
           double percentGraduated[],double percentFreshman[], int& num)
{

   /*
   Pre: univerName[] - array of university name
   state[] - array of state
   city[] - array of city
   tuition[] - array of tuition
   enrollment[] - array of enrollment
   avgFreRetention[] - array of average freshman retention
   percentGraduated[] - array of percentage of student graduated
   percentFreshman[] - array of percentage retention for freshman
   number - reference to number of universities in study
   Post: nothing
   Purpose: read in universities
*/

   ifstream inFile;
   inFile.open("universities.txt");

   if(inFile.fail() == 1)
   {
       cout << "No Such File" << endl;
       exit(100);
   }

   string line;
   num = 0;
   while (!inFile.eof()) // Until end of the file
   {

       getline(inFile,univerName[num]); // read line by line
       getline(inFile,state[num]);

       // while reading one line from file , a new line character appended to the string, so we need to remove it
       univerName[num].resize(univerName[num].size()-1); // remove the last character from string
       state[num].resize(state[num].size()-1); // remove the last character from string

       inFile >> tuition[num] >> enrollment[num] >> avgFreRetention[num] >>percentFreshman[num]>> percentGraduated[num];

       //Printing to console
       cout<<"\n University \t\t\t State \t Tuition \t Enrollment \t %Fresh Succeed \t %Graduate in six year" <<endl;
       cout<<univerName[num]<<"\t\t\t\t"<<state[num]<<"\n"<<tuition[num]<<"\t"<<enrollment[num]<<"\t"<<percentFreshman[num]<<"%"<<"\t"
           <<percentGraduated[num]<<"%"<<endl;

       inFile.ignore(2);
       num++;
   }
   inFile.close();

}//getData

////////////////////////////////// Write to file
void outputFile(ofstream& outFile,string univerName[],string state[],double tuition[],double enrollment[],double percentFreshman[],
               double percentGraduated[],int number)
{
   outFile<<std::left <<setw(50)<<"\nUniversity "<<setw(20) <<" State "<<setw(10) <<" Tuition "<<setw(20) <<" Enrollment "<<setw(20) <<
   " %Fresh Succeed "<<setw(20) <<" %Graduate in six year" <<endl; // Using setw for showing in columns and each column of fixed width

   for(int i=0; i<number; i++)
       // Using setw for showing in columns and each column of fixed width
       outFile<<std::left <<setw(50)<< univerName[i]<<std::left <<setw(20)<<state[i]<<setw(10)<<tuition[i]<<setw(20)<<enrollment[i]<<setw(5)
       <<percentFreshman[i]<<"%"<<setw(15)<<""<<setw(5)<<percentGraduated[i]<<setw(0)<<"%"<<endl;

}//output

CODE SCREENSHOT

SCREEN SHOT OF OUTPUT

1. CONSOLE

2. OUT PUT FILE CREATED