An assignment from my first C class way back in 2002

student_report.c

/*
 * John Barton
 * 201165023
 * jrba@deakin.edu.au
 *
 * The purpose of this program is to read a file, do some things with the data
 * in that file, then output the results into another file.
 * 
 * About the only thing i learnt about software development from this is that
 * sitting down to do some "proper" pseudocode does me no good, when i look
 * at problems, i'm already coding it in some kind of half old school BASIC
 * and half C in my head, and trying to write it out another way doesn't work,
 * so i haven't bothered to submit any psuedocode. The defining diagrams kind
 * of helped, but i probably don't do those right either.
 *
 * About C i learnt that working with files is fairly simple, and the easiest
 * way to keep track on your pointers and everything is to have some scratch
 * paper near the computer to jot down wheter you're working with values,
 * addresses or whatever, because trying to keep all that in your head
 * doesn't work. Also turning on line numbers in vim really helps to recognise
 * errors after gcc tells me about them.
 */

#include <stdio.h>

int read_record(FILE *, char *, int *, char *);
void write_record(FILE *, char [], int, char, char []);
void calculate_grade(int, char *);
void write_headings(FILE *);
void write_header(FILE *);
void acc_totals(int *, int *, int *, int *, int *, int, char, char *);
void write_summary(FILE *, int, int, float, float, float);

int main(void)
{
	char studentID[20], gender, grade[2];
	int examMark, totalFemale, totalMale, totalMaleHD, totalFemaleHD,
		totalMarks, count;
	float percentMaleHD, percentFemaleHD, averageMark;
	FILE *student, *report;

	totalFemale = 0;
	totalMale = 0;
	totalMaleHD = 0;
	totalFemaleHD = 0;
	totalMarks = 0;
	count = 0;

	student = fopen("student.csv", "r");
	report = fopen("report.rpt", "w");

	write_header(report);
	write_headings(report);

	while( read_record(student, studentID, &examMark, &gender) != EOF )
	{
		calculate_grade(examMark, grade);
		gender = toupper(gender);
		acc_totals(&totalFemale, &totalMale, &totalMaleHD, &totalFemaleHD, &totalMarks, examMark, gender, grade);
		write_record(report, studentID, examMark, gender, grade);
		count++;
	}

	percentMaleHD = ((float)totalMaleHD / (float)totalMale) * 100;
	percentFemaleHD = ((float)totalMaleHD / (float)totalFemale) * 100;
	averageMark = (float)totalMarks / (float)count;

	write_summary(report, totalMale, totalFemale, percentFemaleHD, percentMaleHD, averageMark);

	printf("Report written to file \"report.rpt\".\n");

	fclose(student);
	fclose(report);

	return(0);
}

int read_record(FILE *filename, char *studentID, int *examMark, char *gender)
{
	int returnVal = fscanf(filename, "%[^,]%*c%d%*c%c\n", studentID, examMark, gender);
	return(returnVal);
}

void write_record(FILE *filename, char id[20], int examMark, char gender, char grade[2])
{
	fprintf(filename, "%-19s%10d%12c%13s\n", id, examMark, gender, grade);
}

void calculate_grade(int examMark, char *grade)
{
	if( (examMark >= 0) && (examMark < 50) )
		strcpy(grade, "N");
	else if( (examMark >= 50) && (examMark < 60) )
		strcpy(grade, "P");
	else if( (examMark >= 60) && (examMark < 70) )
		strcpy(grade, "C");
	else if( (examMark >= 70) && (examMark < 80) )
		strcpy(grade, "D");
	else if( (examMark >= 80) && (examMark <=100) )
		strcpy(grade, "HD");
}

void write_header(FILE *filename)
{
	fprintf(filename, "\nReport made by student_report.c about student results and gender\n\n");
}

void write_headings(FILE *filename)
{
	fprintf(filename, "Student ID		Exam Mark	Gender	  Grade\n\n");
}

void acc_totals(int *totalFemale, int *totalMale, int *totalMaleHD, int *totalFemaleHD, int *totalMarks, int examMark, char gender, char *grade)
{
	if(gender == 'F')
		*totalFemale += 1;
	else
		*totalMale += 1;

	if( (gender == 'F') && (*grade == 'H') )
		*totalFemaleHD += 1;
	else if( (gender == 'M') && (*grade == 'H') )
		*totalMaleHD += 1;

	*totalMarks += examMark;
}

void write_summary(FILE *filename, int totalMale, int totalFemale, float percentFemaleHD, float percentMaleHD, float averageMark)
{
	fprintf(filename, "\n\nReport Summary:\n");
	fprintf(filename, "Total male students:	%4d\n", totalMale);
	fprintf(filename, "Total female students:	%4d\n\n", totalFemale);
	fprintf(filename, "Percentage of males with a HD:		%4.2f%\n", percentMaleHD);
	fprintf(filename, "Percentage of females with a HD:	%4.2f%%\n\n", percentFemaleHD);
	fprintf(filename, "Average mark:	%4.2f\n", averageMark);
}

It appears I was a big fan of not using braces if i could help it back in the day.