Experiment 11 - Student Record Using Structures

#include <stdio.h>
#include <string.h>

#define MAX_SUBJECTS 5

struct Student {
    int rollNumber;
    char name[50];
    float marks[MAX_SUBJECTS];
    float total;
    float percentage;
};

void inputStudent(struct Student *s, int index) {
    int i;
    printf("\n--- Enter details for Student %d ---\n", index + 1);
    
    printf("Roll Number: ");
    scanf("%d", &s->rollNumber);
    
    printf("Name: ");
    scanf(" %[^\n]", s->name);
    
    printf("Enter marks for %d subjects:\n", MAX_SUBJECTS);
    s->total = 0;
    for (i = 0; i < MAX_SUBJECTS; i++) {
        printf("Subject %d: ", i + 1);
        scanf("%f", &s->marks[i]);
        s->total += s->marks[i];
    }
    
    s->percentage = (s->total / (MAX_SUBJECTS * 100)) * 100;
}

void displayStudent(struct Student s) {
    int i;
    printf("\n--- Student Details ---\n");
    printf("Roll Number: %d\n", s.rollNumber);
    printf("Name: %s\n", s.name);
    printf("Marks: ");
    for (i = 0; i < MAX_SUBJECTS; i++) {
        printf("%.2f ", s.marks[i]);
    }
    printf("\n");
    printf("Total: %.2f\n", s.total);
    printf("Percentage: %.2f%%\n", s.percentage);
}

int searchStudent(struct Student students[], int n, int rollNumber) {
    int i;
    for (i = 0; i < n; i++) {
        if (students[i].rollNumber == rollNumber) {
            return i;
        }
    }
    return -1;
}

int main() {
    struct Student students[100];
    int n, i, searchRoll, index;
    
    printf("Enter number of students: ");
    scanf("%d", &n);
    
    for (i = 0; i < n; i++) {
        inputStudent(&students[i], i);
    }
    
    printf("\n========== ALL STUDENT RECORDS ==========\n");
    for (i = 0; i < n; i++) {
        displayStudent(students[i]);
    }
    
    printf("\nEnter roll number to search: ");
    scanf("%d", &searchRoll);
    
    index = searchStudent(students, n, searchRoll);
    if (index != -1) {
        printf("\nStudent found!\n");
        displayStudent(students[index]);
    } else {
        printf("\nStudent with roll number %d not found.\n", searchRoll);
    }
    
    return 0;
}