write a program to print 5 student records using structure and union

 #include <stdio.h>

struct student {

    char firstName[50];

    int roll;

    float marks;

} s[5];

int main() {

    int i;

    printf("Enter information of students:\n");

    // storing information

    for (i = 0; i < 5; ++i) {

        s[i].roll = i + 1;

        printf("\nFor roll number%d,\n", s[i].roll);

        printf("Enter first name: ");

        scanf("%s", s[i].firstName);

        printf("Enter marks: ");

        scanf("%f", &s[i].marks);

    }

    printf("Displaying Information:\n\n");

    // displaying information

    for (i = 0; i < 5; ++i) {

        printf("\nRoll number: %d\n", i + 1);

        printf("First name: ");

        puts(s[i].firstName);

        printf("Marks: %.1f", s[i].marks);

        printf("\n");

    }

    return 0;

}