Write a prog to read data of 30 students for four subjects. total marks obtained, student with highest marks in each subject and student with highest marks.

//Write a prog to read data of 30 students for four subjects. total marks obtained, student with highest marks in each subject and student with highest marks.
#include<stdio.h>
#define SIZE 30

struct stu {                      //stu for student
   char name[30];
   int rollno;
   int sub[4];
};

void main() {
   int i, j, max, count, total, n, a[SIZE], ni;  // n for number of students
   struct stu st[SIZE];
   clrscr();

   printf("Enter Number of students: ");  // for eg: 2 students
   scanf("%d", &n);

   // loop to print the names and roll numbers
   for (i = 0; i < n; i++) {
      printf("\nEnter name and roll number for student %d : ", i);
      scanf("%s", &st[i].name);
      scanf("%d", &st[i].rollno);
   }

   //loop to print ith student's jth subject
   for (i = 0; i < n; i++) {
      for (j = 0; j <= 4; j++) {
         printf("\nEnter marks of student %d for subject %d : ", i, j);
         scanf("%d", &st[i].sub[j]);
      }
   }

   //(i) for loop to calculate total marks obtained by each student

   for (i = 0; i < n; i++) {
      total = 0;
      for (j = 0; j < 4; j++) {
         total = total + st[i].sub[j];
      }
      printf("\nTotal marks obtained by student %s are %d\n", st[i].name,total);
      a[i] = total;
   }

  // (ii) for loop to list out the student's roll numbers who
   // have secured the highest marks in each subject

   // roll number who secured the highest marks

   for (j = 0; j < 4; j++) {
      max = 0;
      for (i = 0; i < n; i++) {
         if (max < st[i].sub[j]) {
            max = st[i].sub[j];
            ni = i;
         }
      }
      printf("\nStudent %s got maximum marks = %d in Subject : %d",st[ni].name, max, j);
   }

   max = 0;

   for (i = 0; i < n; i++) {
      if (max < a[i]) {
         max = a[i];
         ni = i;
      }
   }

   printf("\n%s obtained the total highest marks.", st[ni].name);
   getch();
}