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student_rank.c

@@ -0,0 +1,124 @@
+// Student rank
+// M.Menault 2024
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "heapsort.h"
+
+void generate_grades(int** students_array, int students_number, int grades_number)
+{
+    int i = 0;
+    for(i=0;i<students_number;i++)
+    {
+	students_array[i] = (int*) malloc(grades_number*sizeof(int));
+        generate_array(students_array[i],grades_number);
+    }
+}
+
+void generate_ranks(int** students_array, int students_number, int grades_number)
+{
+    int i = 0;
+    int j = 0;
+    for(i=0;i<students_number;i++)
+    {
+	students_array[i] = (int*) malloc(grades_number*sizeof(int));
+        for(j=0;j<grades_number;j++)
+	{
+            students_array[i][j] = -1;
+	}
+    }
+}
+
+void free_array(int** students_array, int students_number)
+{
+    int i = 0;
+    for(i=0;i<students_number;i++)
+    {
+        free(students_array[i]);
+    }
+}
+
+void print_student_array(int** students_array, int students_number, int grades_number)
+{
+    int i = 0;
+    printf("----------------------\n");
+    for(i=0;i<students_number;i++)
+    {
+	printf("Student %d : ",i);
+        print_array(students_array[i],grades_number);
+    }
+    printf("----------------------\n");
+}
+
+int find_rank_student(int student_grade, int* grades_array, int students_number)
+{
+    int position = -1;
+    int i = 0;
+    heapsort(grades_array,students_number);
+    for(i = students_number-1; i >= 0; i--)
+    {
+        if(grades_array[i] == student_grade)
+	{
+            position = students_number-i;
+	    break;
+	}
+    }
+    return position;
+}
+
+void sort_students(int** students_rank, int** students_array, int students_number, int grades_number)
+{
+    int i = 0, j = 0;
+    for(i = 0; i < grades_number; i++)
+    {
+        int * grades = (int*) malloc(students_number*sizeof(int));
+	for(j = 0; j < students_number; j++)
+	{
+	    grades[j] = students_array[j][i];
+	}
+        heapsort(grades,students_number);
+	for(j = 0; j < students_number; j++)
+	{
+            students_rank[j][i] = find_rank_student(students_array[j][i],grades,students_number);
+	}
+	free(grades);
+    }
+}
+
+int main(int argc, char** argv)
+{
+    int** student_grades = NULL;
+    int** student_ranks = NULL;
+    int students_length = 0;
+    int grades_length = 0;
+    int debug_mode = 0;
+    
+    if(argc != 4)
+    {
+        printf("Usage : %s <number of student> <number of grade per student> <debug mode : 0|1>\n",argv[0]);
+        return -1;
+    }
+    students_length = atoi(argv[1]);
+    grades_length = atoi(argv[2]);
+    debug_mode = atoi(argv[3]);
+
+    student_grades = (int**) malloc(students_length*sizeof(int*));
+    student_ranks = (int**) malloc(students_length*sizeof(int*));
+    generate_grades(student_grades,students_length,grades_length);
+    generate_ranks(student_ranks,students_length,grades_length);
+    
+    sort_students(student_ranks,student_grades,students_length,grades_length);
+    
+    if(debug_mode)
+    {
+        print_student_array(student_grades,students_length,grades_length);
+        print_student_array(student_ranks,students_length,grades_length);
+    }
+
+    free_array(student_grades,students_length);
+    free_array(student_ranks,students_length);
+    free(student_grades);
+    free(student_ranks);
+    return 0;
+}
+