Question

For the following task, I have written code in C and need help in determining the cause(s) of a segmentation fault which occurs when run.

**It prints the message on line 47 "printf("Reading the input file and writing data to output file simultaneously..."); then results in a segmentation fault (core dumped)
I am using mobaXterm v11.0 (GNU nano 2.0.9)

CSV (comma-separated values) is a popular file format to store tabular kind of data. Each record is in a separate line and each field in a record is separated (delimited) by a comma. For example, if we had a tabular data as shown in the following table.

James Martin	90	80	70	90
Mary Thompson	91	82	74	91
John Garcia	92	84	78	92

This data has three records, each record with 5 fields. A CSV file containing the above data would look as follows

James Martin,90,80,70,90

Mary Thompson,91,82,74,91

John Garcia,92,84,78,92

Some CSV files also contain a header on the first line signifying name of each field. A CSV file can be imported and exported by almost all popular spreadsheet or data processing applications. Since it is a simple text file, we can also view it in any text editor. For this project, write a C program, calc_grade.c, to take input filename and output filename from the command line. The program should read in the input CSV file, gradebook.csv, (passed from command line) which contains names and grades of all 6 projects, midterm, and final exam for 10 (hypothetical) students in this class. Notice that this CSV file has a header, 10 records, and 10 fields. Your program must calculate and output the name, average of project component, average of exam component, weighted total, and the grade letter for each student in output CSV file (filename passed from command line). Please refer below (or the syllabus) on how to perform the calculations. Your output CSV file must have a header, 10 records, and 5 fields, as shown below.

IMPORTANT:

1. Take input filename (argv[1]) and output filename (argv[2]) from the command line.

2. Average of exam component is simply the average of midterm and final.

3. Remember that project makes 40%, midterm makes 30%, and final makes 30% of the weighted total.

4. Limit the calculated values to 2 decimal places when writing to the file.

5. You may use the logic in project 1 to calculate the grade letter.

Example executions:

$ gcc -Wall -o calc_grade calc_grade.c

$ ./calc_grade gradebook.csv output.csv

Your output CSV file (output.csv) should look as follows

Name,Project,Exam,Weighted total,Grade letter

James Martin,95.00,89.50,91.70,A

Mary Thompson,100.00,80.00,88.00,B

John Garcia,80.00,70.00,74.00,C

Patricia Martinez,50.00,90.00,74.00,C-

Robert Robinson,70.00,65.00,67.00,D

Jennifer Clark,92.50,92.50,92.50,A

Michael Rodriguez,94.33,94.00,94.13,A

Linda Lewis,96.17,95.50,95.77,A

William Lee,98.00,97.00,97.40,A

Elizabeth Walker,40.00,60.00,52.00,F

Data in CSV file

Name Project 1 Project 2 Project 3 Project 4 Project 5 Project 6 Midterm Final
James Martin 100 80 70 90 100 100 95 84
Mary Thompson 100 100 100 91 100 100 75 85
John Garcia 80 88 72 60 100 80 68 72
Patricia Martinez 20 40 60 50 20 70 93 87
Robert Robinson 70 50 55 65 75 75 60 70
Jennifer Clark 95 90 90 95 90 95 95 90
Michael Rodriguez 96 92 94 96 92 96 96 92
Linda Lewis 97 94 98 97 94 97 97 94
William Lee 98 96 102 98 96 98 98 96
Elizabeth Walker 20 0 0 80 60 40 70 50

#include <stdio . h> #include <stdlib.h> #include <string.h> /* function decla ration */ void process File (char [], char []); void writeToOutput (FILE *, char [], char [], char [), char [), char [], char [], char [, char [], char []); char |double getTotal (double [], double, double, double |char* getLette rG rade (double ); double /* main function */ int main (int argc, char **argv) { if (argc 3) f printf("Error, input/output names must be supplied \n"); return 1; - } char infile = argv[1]; char *outfile = argv[2]; process File (infile, outfile); return 0;*change later? */ } /*function to read the input file line by line process the grades and write the data to the csv simultaneous ly */ void process File (char infile [ ] , char outfile [ ] )

FILE reader, *writer; reader= fopen(infile, "r"); /*checking if input file was success open or not */ if (!reader) printf("error file not found "); return; } writer char line[500]; fgets (line, 500, reader); /* header escape */ fopen (outfile, "w"); = /* printing header to output */ fprintf(writer, "Name,Project, Exam, Weighted total,Grade letter\n"); // potential error? printf("Reading the input file and writing data to output file simultaneously.. \n"); /* Reading input file line by line */ while (fgets (line,500, reader) != NULL) { char token strtok (line, \t"); = char fname token; = strtok (NULL, \t"); token = char *lname token; strtok (NULL, char *prjl = token; strtok (NULL, token \t"); token \t"); char *prj2 token; strtok (NULL, char *prj3 token; token = strtok (NULL, token \t"); = \t");

char *prj4 token token; = strtok(NULL, char *prj5 token; = strtok(NULL, token; token strtok ( NULL , token; token = strtok ( NULL, token; token= strtok ( NULL , \t"); = token char *prj6 \t"); = \t"); char midterm = \t"); char final \t"); /*checking for newline char in grade of final exam string */ '\n') 1] writeTo0utput (writer, fname, lname, prjl, prj2, prj3, prj4, if (final Îstrlen ( final ) - 1] final [strlen ( final ) == '\0'; == prj5, prj6, midterm, final); /* closing files */ fclose (reader) ; fclose (writer) ; /* printing success msg */ printf("\n Output file made successfully\n "); helper function to write data to output file one at a time */ void writeTooutput (FILE *fpr, char fname [] , char lname [ ], char prj1[], char prj 2 [ ] , char prj3 [, char prj4 char prj5í), char prj6[], char mid[], char finall]) double projectGrades [6]; double projectGrade = 0; double avgExamGrade = 0; /* rename later? */

projectGrades [0] projectGrades [1] projectGrades [2] projectGrades [3] = atof(prj4); projectGrades [4] = atof(prj5); projectGrades [5] double midte rm double finalExam double total atof(prj1); = atof(prj2); atof(prj3); = atof (prj6); atof(mid); atof(final); getTotal (p rojectGrades, midte rm, = = finalExam, &projectGrade, &avgExamGrade); getLetterGrade (total ) ; char letterG rade = fprintf(fpr, "$s %s, %.2lf, %.2lf, %.2lf, %s\n", fname, lname, projectGrade, avgExamGrade, total, lette rGrade); /* function to return the weighted total of grades and return the average project grade and grade by reference */ exam /potentially misnamed parts here double getTotal(double projectGrades [], double midterm, double finalExam, double avgProjectGrade, double avgExamG rade) (projectGrades [0] projectGrades [3] (totalProjectGrades / 6.0); finalExam) / 2.0); projectGrades [1] projectGrades [4] projectGrades [2] + projectGrades [5] ) ; double totalProjectGrades = + + *avgProjectGrade avgExamGrade = ( (midterm double projectGrade = (*avgP rojectGrade double midGrade = midterm * 30.0 / 100.0; final Exam = *40.0 100.0); double finalGrade double total = projectGrade return total; * 30.Θ 100.0 ; + midGrade+ finalGrade; =

char* getLetterGrade (double total) { static char grade [5]; if(total 100.0) =90.0 && total .strcpy(grade, "A\0"); = 80.0 && total else if(total <90.0 strcpy(grade, "B\0"); >= 75.0 && total strcpy(grade, "C\0"); else if(total >= 70.0 && total strcpy(grade, "C-\0"); =65.0 && total else if(total 80.0) <75.0) else if(total 70.0) strcpy(grade, "D\0"); 60.0 && total else if(total <65.0) strcpy(grade, "D-\0"); 60) else if(totali strcpy(grade, "F\0"); return grade;

TEXT VERSION:

#include
#include
#include

/* function declaration */

void processFile (char [], char []);
void writeToOutput (FILE *, char [], char [], char [], char [], char [],
char [], char [], char [], char [], char []);

double getTotal (double [], double, double, double *, double *);
char* getLetterGrade(double);

/* main function */

int main (int argc, char **argv)
{
if (argc != 3)
{
printf("Error, input/output names must be supplied \n");
return -1;
}
char *infile = argv[1];
char *outfile = argv[2];

processFile(infile, outfile);
return 0;
}

/* function to read the input file line by line
process the grades and write the data to the csv simultaneously */

void processFile (char infile[], char outfile[])
{
FILE *reader, *writer;
reader = fopen(infile, "r");

/* checking if input file was success open or not */
if (!reader)
{
printf("error file not found");
return;
}
writer = fopen (outfile, "w");
char line[500];
fgets (line, 500, reader); /* header escape */

/* printing header to output */
fprintf(writer, "Name,Project,Exam,Weighted total,Grade letter\n"); // potential error?
printf("Reading the input file and writing data to output file simultaneously.. \n");

/* Reading input file line by line */
while(fgets(line,500,reader) != NULL)
{
char *token = strtok(line, " \t");
char *fname = token;
token = strtok(NULL, " \t");
char *lname = token;
token = strtok(NULL, " \t");
char *prj1 = token;
token = strtok(NULL, " \t");
char *prj2 = token;
token = strtok(NULL, " \t");
char *prj3 = token;
token = strtok(NULL, " \t");
char *prj4 = token;
token = strtok(NULL, " \t");
char *prj5 = token;
token = strtok(NULL, " \t");
char *prj6 = token;
token = strtok(NULL, " \t");
char *midterm = token;
token = strtok(NULL, " \t");
char *final = token;
token = strtok(NULL, " \t");

/* checking for newline char in grade of final exam string */
if (final [strlen(final) - 1] == '\n')
final [strlen(final) - 1] == '\0';
writeToOutput(writer, fname, lname, prj1, prj2, prj3, prj4,
prj5, prj6, midterm, final);
}
/* closing files */
fclose (reader);
fclose (writer);
/* printing success msg */
printf("\n Output file made successfully\n ");
}

/* helper function to write data to output file one at a time */

void writeToOutput (FILE *fpr, char fname[], char lname[], char prj1[], char prj2[], char prj3 [],
char prj4 [], char prj5[], char prj6[], char mid[], char final[])
{
double projectGrades[6];
double projectGrade = 0;
double avgExamGrade = 0; /* rename later? */
projectGrades[0] = atof(prj1);
projectGrades[1] = atof(prj2);
projectGrades[2] = atof(prj3);
projectGrades[3] = atof(prj4);
projectGrades[4] = atof(prj5);
projectGrades[5] = atof(prj6);
double midterm = atof(mid);
double finalExam = atof(final);
double total = getTotal(projectGrades, midterm, finalExam,
&projectGrade, &avgExamGrade);
char *letterGrade = getLetterGrade(total);
fprintf(fpr, "%s %s, %.2lf, %.2lf, %.2lf, %s\n", fname, lname, projectGrade,
avgExamGrade, total, letterGrade);
}

/* function to return the weighted total of grades and return the average project grade
and exam grade by reference */

// potentially misnamed parts here
double getTotal(double projectGrades[], double midterm, double finalExam,
double *avgProjectGrade, double *avgExamGrade)
{
double totalProjectGrades = (projectGrades[0] + projectGrades[1] + projectGrades[2] +
projectGrades[3] + projectGrades[4] + projectGrades[5]);
*avgProjectGrade = (totalProjectGrades / 6.0);
*avgExamGrade = ((midterm + finalExam) / 2.0);
double projectGrade = (*avgProjectGrade * 40.0 / 100.0);
double midGrade = midterm * 30.0 / 100.0;
double finalGrade = finalExam * 30.0 / 100.0;
double total = projectGrade + midGrade + finalGrade;
return total;
}

// comments

char* getLetterGrade(double total)
{
static char grade[5];
if(total >= 90.0 && total <= 100.0)
strcpy(grade, "A\0");
else if(total >= 80.0 && total < 90.0)
strcpy(grade, "B\0");
else if(total >= 75.0 && total < 80.0)
strcpy(grade, "C\0");
else if(total >= 70.0 && total < 75.0)
strcpy(grade, "C-\0");
else if(total >= 65.0 && total < 70.0)
strcpy(grade, "D\0");
else if(total >= 60.0 && total < 65.0)
strcpy(grade, "D-\0");
else if(total < 60)
strcpy(grade, "F\0");
return grade;
}

Answer 1

Hi i am answering your question hope this will be helpful to you, kindly give a thumbs up if it helps you and do comment if you have any doubt regarding the same. one more thing i am not changing inside the logic the claculation logic will be same as you did.

code:-

#include<iostream>
#include<fstream>
#include<cstring>

/* function declaration */

void processFile (char [], char []);
void writeToOutput (FILE *, char [], char [], char [], char [], char [],
char [], char [], char [], char [], char []);

double getTotal (double [], double, double, double *, double *);
char* getLetterGrade(double);

/* main function */

int main (int argc, char **argv)
{
if (argc != 3)
{
printf("Error, input/output names must be supplied \n");
return -1;
}
char *infile = argv[1];
char *outfile = argv[2];
processFile(infile, outfile);
return 0;
}

/* function to read the input file line by line
process the grades and write the data to the csv simultaneously */

void processFile (char infile[], char outfile[])
{
FILE *reader, *writer;
reader = fopen(infile, "r");
  
/* checking if input file was success open or not */
if (!reader)
{
printf("error file not found");
return;
}
writer = fopen (outfile, "w");
char line[500];
fgets (line, 500, reader); /* header escape */
  
/* printing header to output */
fprintf(writer, "Name,Project,Exam,Weighted total,Grade letter\n"); // potential error?
printf("Reading the input file and writing data to output file simultaneously.. \n");

/* Reading input file line by line */
while(fgets(line,500,reader) != NULL)
{
char *token = strtok(line, " \t");
char *fname = token;
token = strtok(NULL, " \t");
char *lname = token;
token = strtok(NULL, " \t");
char *prj1 = token;
token = strtok(NULL, " \t");
char *prj2 = token;
token = strtok(NULL, " \t");
char *prj3 = token;
token = strtok(NULL, " \t");
char *prj4 = token;
token = strtok(NULL, " \t");
char *prj5 = token;
token = strtok(NULL, " \t");
char *prj6 = token;
token = strtok(NULL, " \t");
char *midterm = token;
token = strtok(NULL, " \t");
char *final = token;
token = strtok(NULL, " \t");
  
/* checking for newline char in grade of final exam string */
if (final [strlen(final) - 1] == '\n')
final [strlen(final) - 1] == '\0';
writeToOutput(writer, fname, lname, prj1, prj2, prj3, prj4,
prj5, prj6, midterm, final);
}
/* closing files */
fclose (reader);
fclose (writer);
/* printing success msg */
printf("\n Output file made successfully\n ");
}

/* helper function to write data to output file one at a time */

void writeToOutput (FILE *fpr, char fname[], char lname[], char prj1[], char prj2[], char prj3 [],
char prj4 [], char prj5[], char prj6[], char mid[], char final[])
{
double projectGrades[6];
double projectGrade = 0;
double avgExamGrade = 0; /* rename later? */
projectGrades[0] = atof(prj1);
projectGrades[1] = atof(prj2);
projectGrades[2] = atof(prj3);
projectGrades[3] = atof(prj4);
projectGrades[4] = atof(prj5);
projectGrades[5] = atof(prj6);
double midterm = atof(mid);
double finalExam = atof(final);
double total = getTotal(projectGrades, midterm, finalExam,
&projectGrade, &avgExamGrade);
char *letterGrade = getLetterGrade(total);
fprintf(fpr, "%s %s, %.2lf, %.2lf, %.2lf, %s\n", fname, lname, projectGrade,
avgExamGrade, total, letterGrade);
}

/* function to return the weighted total of grades and return the average project grade
and exam grade by reference */

// potentially misnamed parts here
double getTotal(double projectGrades[], double midterm, double finalExam,
double *avgProjectGrade, double *avgExamGrade)
{
double totalProjectGrades = (projectGrades[0] + projectGrades[1] + projectGrades[2] +
projectGrades[3] + projectGrades[4] + projectGrades[5]);
*avgProjectGrade = (totalProjectGrades / 6.0);
*avgExamGrade = ((midterm + finalExam) / 2.0);
double projectGrade = (*avgProjectGrade * 40.0 / 100.0);
double midGrade = midterm * 30.0 / 100.0;
double finalGrade = finalExam * 30.0 / 100.0;
double total = projectGrade + midGrade + finalGrade;
return total;
}

// comments

char* getLetterGrade(double total)
{
static char grade[5];
  
if(total >= 90.0 && total <= 100.0)
strcpy(grade, "A\0");
else if(total >= 80.0 && total < 90.0)
strcpy(grade, "B\0");
else if(total >= 75.0 && total < 80.0)
strcpy(grade, "C\0");
else if(total >= 70.0 && total < 75.0)
strcpy(grade, "C-\0");
else if(total >= 65.0 && total < 70.0)
strcpy(grade, "D\0");
else if(total >= 60.0 && total < 65.0)
strcpy(grade, "D-\0");
else if(total < 60)
strcpy(grade, "F\0");
return grade;
}

grade.txt // or any name you want

Name Project 1 Project 2 Project 3 Project 4 Project 5 Project 6 Midterm Final
James Martin 100 80 70 90 100 100 95 84
Mary Thompson 100 100 100 91 100 100 75 85
John Garcia 80 88 72 60 100 80 68 72
Patricia Martinez 20 40 60 50 20 70 93 87
Robert Robinson 70 50 55 65 75 75 60 70
Jennifer Clark 95 90 90 95 90 95 95 90
Michael Rodriguez 96 92 94 96 92 96 96 92
Linda Lewis 97 94 98 97 94 97 97 94
William Lee 98 96 102 98 96 98 98 96
Elizabeth Walker 20 0 0 80 60 40 70 50

output.txt // the second argument to the program

Name,Project,Exam,Weighted total,Grade letter
James Martin, 90.00, 89.50, 89.70, B
Mary Thompson, 98.50, 80.00, 87.40, B
John Garcia, 80.00, 70.00, 74.00, C-
Patricia Martinez, 43.33, 90.00, 71.33, C-
Robert Robinson, 65.00, 65.00, 65.00, D
Jennifer Clark, 92.50, 92.50, 92.50, A
Michael Rodriguez, 94.33, 94.00, 94.13, A
Linda Lewis, 96.17, 95.50, 95.77, A
William Lee, 98.00, 97.00, 97.40, A
Elizabeth Walker, 33.33, 60.00, 49.33, F

output:-

Reading the input file and writing data to output file simultaneously.. Output file made successfully

happy to help just try running the code above and check.