WAP to create Database using array of structure & display it in C

#include <stdio.h>

struct Student {
    int rollNo;
    char name[50];
    float marks;
};

int main() {
    int numStudents;
    printf("Enter the number of students: ");
    scanf("%d", &numStudents);

    struct Student students[numStudents];

    for (int i = 0; i < numStudents; i++) {
        printf("Enter details for student %d:\n", i + 1);
        printf("Roll No: ");
        scanf("%d", &students[i].rollNo);
        printf("Name: ");
        scanf("%s", students[i].name);
        printf("Marks: ");
        scanf("%f", &students[i].marks);
        printf("\n");
    }

    printf("Student Database:\n");
    for (int i = 0; i < numStudents; i++) {
        printf("Student %d\n", i + 1);
        printf("Roll No: %d\n", students[i].rollNo);
        printf("Name: %s\n", students[i].name);
        printf("Marks: %.2f\n", students[i].marks);
        printf("\n");
    }

    return 0;
}

Explanation:

1. We start by including the standard input/output library stdio.h, which provides functions for input and output operations in C.

2. Next, we define a structure called Student with three members: rollNo (integer), name (character array of size 50), and marks (float).

3. In the main function, we declare a variable numStudents to store the number of students.

4. We prompt the user to enter the number of students using printf and read the input using scanf.

5. We then declare an array of structures students with size numStudents to store the student details.

6. Using a for loop, we iterate numStudents times to input the details for each student.

7. Inside the loop, we prompt the user to enter the details for each student, such as roll number, name, and marks, using printf. We read the input using scanf and store the values in the corresponding members of the students array.

8. After the loop, we display the student database using another for loop. We iterate over each student in the students array and print their roll number, name, and marks using printf.

9. Finally, we return 0 from the main function, indicating successful execution of the program.

This program allows the user to create a database of students by entering their details and then displays the database on the console.