#include <stdio.h>
#include <stdlib.h>

// Define a structure to represent a student record.
struct student {
  int roll_no;
  char name[20];
  int marks;
};

// Function to allocate dynamic memory for n student records.
struct student* allocate_memory(int n) {
  struct student* students = (struct student*)malloc(n * sizeof(struct student));

  if (students == NULL) {
    printf("Error allocating memory!\n");
    exit(1);
  }

  return students;
}

// Function to scan student records from the user and store them in the array of structures.
void scan_student_records(struct student* students, int n) {
  for (int i = 0; i < n; i++) {
    printf("Enter roll no. of student %d: ", i + 1);
    scanf("%d", &students[i].roll_no);

    printf("Enter name of student %d: ", i + 1);
    scanf("%s", students[i].name);

    printf("Enter marks of student %d: ", i + 1);
    scanf("%d", &students[i].marks);
  }
}

// Function to print student records from the array of structures.
void print_student_records(struct student* students, int n) {
  printf("\nStudent records:\n");
  printf("Roll No. | Name | Marks\n");
  printf("------- | ---- | ------\n");

  for (int i = 0; i < n; i++) {
    printf("%d       | %s     | %d\n", students[i].roll_no, students[i].name, students[i].marks);
  }
}

// Main function.
int main() {
  int n;

  printf("Enter the number of student records: ");
  scanf("%d", &n);

  // Allocate dynamic memory for n student records.
  struct student* students = allocate_memory(n);

  // Scan the student records from the user and store them in the array of structures.
  scan_student_records(students, n);

  // Print the student records from the array of structures.
  print_student_records(students, n);

  // Free the dynamically allocated memory.
  free(students);

  return 0;
}

Sample output:

Enter the number of student records: 2

Enter roll no. of student 1: 1
Enter name of student 1: John Doe
Enter marks of student 1: 90

Enter roll no. of student 2: 2
Enter name of student 2: Jane Doe
Enter marks of student 2: 85

Student records:
Roll No. | Name | Marks
------- | ---- | ------\
1       | John Doe     | 90
2       | Jane Doe     | 85

Further Reading:

Dynamic Memory allocation or Run time memory allocation in c

What is static memory allocation and dynamic memory allocation?

Write a c program to allocate dynamic memory for 5 integers scan it and print it

write a c program to allocate dynamic memory for n integers scan it and print n value takes it run times

write a c program to allocate dynamic memory for one string scan it print it

write a c program to allocate dynamic memory for three string scan it and print it

Write a c program to allocate a dynamic memory for n string

c program to allocate dynamic memory for 2D array integers where a number of rows and numbers of columns scan from the user at run time,

Write a c program to allocate a dynamic memory for 1 student record it and scan it and print it

write a c program to allocate a dynamic memory for three student record scan it and print it using structure

write a c program Allocate a dynamic memory for n students record it scan it and print it using structure

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