Replace keskmineHinne.c

keskmineHinne/keskmineHinne.c

@@ -8,40 +8,58 @@
  * 				finds the best and the worst.
  * 				finds the best and the worst.
  */
  */
 
 
-#include <stdio.h>
-#include <string.h>
-#include "struktuur.h"
-
-int numberofRows (); // counts the rows in the file
-void readStudents (Stud *to_be_graded); // scans in the data from the file
-int sieve (Stud *to_be_graded, Filtered *applicable, int n, char DVW); // filters out students with unapplicable grades
-void sortbyName (Filtered *applicable, int applicable_amount, char DVW); // sorts by name
-int list (Filtered *applicable, int , Avg *student_list, char DVW); // makes a sorted list
-void average (Avg *student_list, Filtered *applicable, int applicable_amount, int student_amount, char DVW); // calculates each student's average
-void sortbyAverage (Avg *student_list, int student_amount, char DVW); // sorts by grade
-void money (Avg *student_list, int student_amount); // determines who gets the money and who gets the bill
-void bill (Avg *student_list, int student_amount); // outputs bills into file
+#include <stdio.h> // print, scan
+#include <string.h> // strcpy, strcmp
+#include "struktuur.h" // holds the structs
+
+// counts the rows in the file
+int numberofRows ();
+
+// scans in the data from the file
+void readStudents (Stud *to_be_graded);
+
+// filters out students with unapplicable grades
+int sieve (Stud *to_be_graded, Filtered *applicable, int n, char DVW);
+
+// sorts by name
+void sortbyName (Filtered *applicable, int applicable_amount, char DVW);
+
+// makes a sorted list
+int list (Filtered *applicable, int , Avg *student_list, char DVW);
+
+// calculates each student's average
+void average (Avg *student_list, Filtered *applicable, int applicable_amount, int student_amount, char DVW);
+
+// sorts by grade
+void sortbyAverage (Avg *student_list, int student_amount, char DVW);
+
+// determines who gets the money and who gets the bill
+void money (Avg *student_list, int student_amount);
+
+// outputs bills into file
+void bill (Avg *student_list, int student_amount);
 
 
 int main (void)
 int main (void)
 {
 {
-	char DVW;
-	printf ("Print all or silent? [p/s]");
-	do
+	char DVW; // var to hold the answer
+	printf ("Print all or silent? [p/s]"); 
+
+	do // only accepts s or p
 	{
 	{
-		scanf ("%c", &DVW);
+		scanf ("%c", &DVW); // determines whether functions print results or not
 	} while (DVW != 'p' && DVW != 's');
 	} while (DVW != 'p' && DVW != 's');
 	printf ("\n\n");
 	printf ("\n\n");
 
 
 	int n;
 	int n;
-	n = numberofRows();
+	n = numberofRows(); // counts how many rows the file contains
 
 
-	Stud to_be_graded[n];
-	Filtered applicable[n];
-	Avg student_list[n];
-	int applicable_amount;
-	int student_amount;
+	Stud to_be_graded[n]; // var to hold first scan results
+	Filtered applicable[n]; // var to hold applicable 
+	Avg student_list[n]; // var to hold each student and their avg grade
+	int applicable_amount; // nr of applicable elements
+	int student_amount; // nr of students
 
 
-	readStudents(to_be_graded);
+	readStudents(to_be_graded); 
 	printf ("\n\n");
 	printf ("\n\n");
 
 
 	applicable_amount = sieve (to_be_graded, applicable, n, DVW);
 	applicable_amount = sieve (to_be_graded, applicable, n, DVW);
@@ -64,41 +82,44 @@ int main (void)
 int numberofRows()
 int numberofRows()
 {
 {
 	FILE *data;
 	FILE *data;
-	data = fopen ("andmed.txt", "r");
+	data = fopen ("andmed.txt", "r"); // opens the file
 
 
 	int read = 0;
 	int read = 0;
 	int ch = 0;
 	int ch = 0;
 
 
-	if (data == NULL)
+	if (data == NULL) // if file doesn't exist, returns 0
 	{
 	{
 		return 0;
 		return 0;
 	}
 	}
 
 
-	while ((ch = fgetc (data)) != EOF)
+// scans every character, if the char is '\n' then the counter counts up
+	while ((ch = fgetc (data)) != EOF) 
 	{
 	{
 		if (ch == '\n')
 		if (ch == '\n')
 		{
 		{
 			read++;
 			read++;
 		}
 		}
 	}
 	}
-	fclose (data);
+	fclose (data); // closes the file
 
 
-	return read;
+	return read; // returns the nr of rows
 }
 }
 
 
 void readStudents (Stud *to_be_graded)
 void readStudents (Stud *to_be_graded)
 {
 {
 	FILE *data;
 	FILE *data;
-	data = fopen ("andmed.txt", "r");
+	data = fopen ("andmed.txt", "r"); // opens the file
 
 
 	int i = 0;
 	int i = 0;
 
 
+	// reads in the data from the file
 	while (fscanf (data, "%s %s %d", to_be_graded[i].name, to_be_graded[i].subj, &to_be_graded[i].grade) != EOF)
 	while (fscanf (data, "%s %s %d", to_be_graded[i].name, to_be_graded[i].subj, &to_be_graded[i].grade) != EOF)
 	{
 	{
+		// prints the data to the screen
 		printf ("%d. %s, %s, %d\n", i+1, to_be_graded[i].name, to_be_graded[i].subj, to_be_graded[i].grade);
 		printf ("%d. %s, %s, %d\n", i+1, to_be_graded[i].name, to_be_graded[i].subj, to_be_graded[i].grade);
 		i++;
 		i++;
 	}
 	}
-	fclose (data);
+	fclose (data); // closes the file
 }
 }
 
 
 int sieve (Stud *to_be_graded, Filtered *applicable, int n, char DVW)
 int sieve (Stud *to_be_graded, Filtered *applicable, int n, char DVW)
@@ -106,6 +127,7 @@ int sieve (Stud *to_be_graded, Filtered *applicable, int n, char DVW)
 	int i;
 	int i;
 	int j = 0;
 	int j = 0;
 
 
+	// if the grade is between 0 and 5, then copy row to applicable
 	for (i = 0; i < n; i++)
 	for (i = 0; i < n; i++)
 	{
 	{
 		if (to_be_graded[i].grade >= 0 && to_be_graded[i].grade <= 5)
 		if (to_be_graded[i].grade >= 0 && to_be_graded[i].grade <= 5)
@@ -116,7 +138,8 @@ int sieve (Stud *to_be_graded, Filtered *applicable, int n, char DVW)
 		}
 		}
 	}
 	}
 
 
-	if (DVW == 80 || DVW == 112)
+	// if the input character is p, it prints the result
+	if (DVW == 112) // 112 is the ascii value of 'p'
 	{
 	{
 		for (i = 0; i < j; i++)
 		for (i = 0; i < j; i++)
 		{
 		{
@@ -125,7 +148,7 @@ int sieve (Stud *to_be_graded, Filtered *applicable, int n, char DVW)
 		printf ("\n\n");
 		printf ("\n\n");
 	}
 	}
 
 
-	return j;
+	return j; // returns nr of applicable rows
 }
 }
 
 
 void sortbyName (Filtered *applicable, int applicable_amount, char DVW)
 void sortbyName (Filtered *applicable, int applicable_amount, char DVW)
@@ -134,6 +157,7 @@ void sortbyName (Filtered *applicable, int applicable_amount, char DVW)
 	int j;
 	int j;
 	Filtered temp;
 	Filtered temp;
 
 
+	// sorts applicable alphabetically
 	for (i = 0; i < applicable_amount; i++)
 	for (i = 0; i < applicable_amount; i++)
 	{
 	{
 		for (j = 1; j < applicable_amount; j++)
 		for (j = 1; j < applicable_amount; j++)
@@ -150,7 +174,8 @@ void sortbyName (Filtered *applicable, int applicable_amount, char DVW)
 		}
 		}
 	}
 	}
 
 
-	if (DVW == 80 || DVW == 112)
+	// if the input character is p, it prints the result
+	if (DVW == 112) // 112 is the ascii value of 'p'
 	{
 	{
 		for (i = 0; i < applicable_amount; i++)
 		for (i = 0; i < applicable_amount; i++)
 		{
 		{
@@ -166,6 +191,7 @@ int list (Filtered *applicable, int applicable_amount, Avg *student_list, char D
 	int i;
 	int i;
 	int j = 0;
 	int j = 0;
 
 
+	// makes a list where each name appears once
 	for (i = 0; i < applicable_amount; i++)
 	for (i = 0; i < applicable_amount; i++)
 	{
 	{
 		if (strcmp (applicable[i-1].name, applicable[i].name) != 0)
 		if (strcmp (applicable[i-1].name, applicable[i].name) != 0)
@@ -175,7 +201,8 @@ int list (Filtered *applicable, int applicable_amount, Avg *student_list, char D
 		}
 		}
 	}
 	}
 
 
-	if (DVW == 80 || DVW == 112)
+	// if the input character is p, it prints the result
+	if (DVW == 112) // 112 is the ascii value of 'p'
 	{
 	{
 		for (i = 0; i < j; i++)
 		for (i = 0; i < j; i++)
 		{
 		{
@@ -184,7 +211,7 @@ int list (Filtered *applicable, int applicable_amount, Avg *student_list, char D
 		printf ("\n\n");
 		printf ("\n\n");
 	}
 	}
 
 
-	return j;
+	return j; // returns the nr of students
 }
 }
 
 
 void average (Avg *student_list, Filtered *applicable, int applicable_amount, int student_amount, char DVW)
 void average (Avg *student_list, Filtered *applicable, int applicable_amount, int student_amount, char DVW)
@@ -193,6 +220,7 @@ void average (Avg *student_list, Filtered *applicable, int applicable_amount, in
 	int j;
 	int j;
 	int counter = 0;
 	int counter = 0;
 
 
+	// calculates the average of each student
 	for (i = 0; i < student_amount; i++)
 	for (i = 0; i < student_amount; i++)
 	{
 	{
 		for (j = 0; j < applicable_amount; j++)
 		for (j = 0; j < applicable_amount; j++)
@@ -207,7 +235,8 @@ void average (Avg *student_list, Filtered *applicable, int applicable_amount, in
 		counter = 0;
 		counter = 0;
 	}
 	}
 
 
-	if (DVW == 80 || DVW == 112)
+	// if the input character is p, it prints the result
+	if (DVW == 112) // 112 is the ascii value of 'p'
 	{
 	{
 		for (i = 0; i < student_amount; i++)
 		for (i = 0; i < student_amount; i++)
 		{
 		{
@@ -223,6 +252,7 @@ void sortbyAverage (Avg *student_list, int student_amount, char DVW)
 	int i, j;
 	int i, j;
 	Avg temp;
 	Avg temp;
 
 
+	// sorts list by average grade
 	for (i = 0; i < student_amount; i++)
 	for (i = 0; i < student_amount; i++)
 	{
 	{
 		for (j = 1; j < student_amount; j++)
 		for (j = 1; j < student_amount; j++)
@@ -236,7 +266,8 @@ void sortbyAverage (Avg *student_list, int student_amount, char DVW)
 		}
 		}
 	}
 	}
 
 
-	if (DVW == 80 || DVW == 112)
+	// if the input character is p, it prints the result
+	if (DVW == 112) // 112 is the ascii value of 'p'
 	{
 	{
 		for (i = 0; i < student_amount; i++)
 		for (i = 0; i < student_amount; i++)
 		{
 		{
@@ -252,6 +283,7 @@ void money (Avg *student_list, int student_amount)
 	int i;
 	int i;
 	int counter = 0;
 	int counter = 0;
 
 
+	// prints the first 3 names
 	printf ("The money goes to: \n");
 	printf ("The money goes to: \n");
 	for (i = 0; i < 3; i++)
 	for (i = 0; i < 3; i++)
 	{
 	{
@@ -259,6 +291,8 @@ void money (Avg *student_list, int student_amount)
 	}
 	}
 	counter = i;
 	counter = i;
 
 
+	// checks if the 4th person from the top has the same average as the 3rd,
+	// if that is true, also prints the 4th student's info and then the 5th and so on
 	do
 	do
 	{
 	{
 		if (student_list[counter].average == student_list[2].average)
 		if (student_list[counter].average == student_list[2].average)
@@ -268,63 +302,45 @@ void money (Avg *student_list, int student_amount)
 		}
 		}
 		else
 		else
 		{
 		{
-			break;
+			break;// stops the loop, if there is a difference in the average grade
 		};
 		};
 	} while (student_list[i].average == student_list[2].average);
 	} while (student_list[i].average == student_list[2].average);
 	printf ("\n\n");
 	printf ("\n\n");
 
 
-
-	printf ("The bills go to: \n");
-	for (i = student_amount - 3; i < student_amount; i++)
-	{
-		printf ("%s, with an average of: %f\n", student_list[i].name, student_list[i].average);
-	}
-
-	counter = student_amount - 4;
-
-	do
-	{
-		if (student_list[counter].average == student_list[i - 3].average)
-		{
-			printf ("%s, with an average of: %f\n", student_list[counter].name, student_list[counter].average);
-			counter--;
-		}
-		else
-		{
-			break;
-		};
-	} while (student_list[counter].average == student_list[i - 3].average);
-
 }
 }
 
 
 void bill (Avg *student_list, int student_amount)
 void bill (Avg *student_list, int student_amount)
 {
 {
-	int counter;
+	int counter = student_amount - 4;
 	int i;
 	int i;
 
 
 	FILE *output;
 	FILE *output;
-	output = fopen ("bill.txt", "w");
+	output = fopen ("bill.txt", "w"); // opens the output file
 
 
+	// prints the last 3 people from student_list to the output file
+	printf ("The bills go to: \n");
 	fprintf (output, "The bills go to: \n");
 	fprintf (output, "The bills go to: \n");
 	for (i = student_amount - 3; i < student_amount; i++)
 	for (i = student_amount - 3; i < student_amount; i++)
 	{
 	{
+		printf ("%s, with an average of: %f\n", student_list[i].name, student_list[i].average);
 		fprintf (output, "%s, with an average of: %.2f\n", student_list[i].name, student_list[i].average);
 		fprintf (output, "%s, with an average of: %.2f\n", student_list[i].name, student_list[i].average);
 	}
 	}
 
 
-	counter = student_amount - 4;
-
+	// checks if the 4th person from the bottom has the same average as the 3rd,
+	// if that is true, also prints the 4th student's info and then the 5th and so on
 	do
 	do
 	{
 	{
 		if (student_list[counter].average == student_list[i - 3].average)
 		if (student_list[counter].average == student_list[i - 3].average)
 		{
 		{
+			printf ("%s, with an average of: %f\n", student_list[counter].name, student_list[counter].average);
 			fprintf (output, "%s, with an average of: %f\n", student_list[counter].name, student_list[counter].average);
 			fprintf (output, "%s, with an average of: %f\n", student_list[counter].name, student_list[counter].average);
 			counter--;
 			counter--;
 		}
 		}
 		else
 		else
 		{
 		{
-			break;
+			break; // stops the loop, if there is a difference in the average grade
 		};
 		};
 	} while (student_list[counter].average == student_list[i - 3].average);
 	} while (student_list[counter].average == student_list[i - 3].average);
 
 
-	fclose (output);
+	fclose (output); // closes the file
 }
 }