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DS/C/Lab/Week2/StudentRecordsFile.c

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+#include <stdio.h>
+
+typedef struct {
+    char name[50];
+    int roll_no;
+    char grade;
+    char branch[50];
+} Student;
+
+void write_student_records(const char filename[], Student students[], int n) {
+    FILE *file = fopen(filename, "w");
+    if (file == NULL) {
+        printf("Error opening file.\n");
+        return;
+    }
+
+    for (int i = 0; i < n; i++) {
+        fprintf(file, "%s %d %c %s\n", students[i].name, students[i].roll_no, students[i].grade, students[i].branch);
+    }
+
+    fclose(file);
+}
+
+void store_branchwise_records(const char filename[]) {
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        printf("Error opening file.\n");
+        return;
+    }
+
+    Student student;
+    char branch_filename[50];
+
+    while (fscanf(file, "%s %d %c %s", student.name, &student.roll_no, &student.grade, student.branch) != EOF) {
+        sprintf(branch_filename, "%s.txt", student.branch);
+        FILE *branch_file = fopen(branch_filename, "a");
+        if (branch_file == NULL) {
+            printf("Error opening branch file.\n");
+            continue;
+        }
+        fprintf(branch_file, "%s %d %c\n", student.name, student.roll_no, student.grade);
+        fclose(branch_file);
+    }
+
+    fclose(file);
+}
+
+int main() {
+    int n;
+    printf("Enter the number of students: ");
+    scanf("%d", &n);
+
+    Student students[n];
+
+    for (int i = 0; i < n; i++) {
+        printf("Enter details for student %d:\n", i + 1);
+        printf("Name: ");
+        scanf("%s", students[i].name);
+        printf("Roll No: ");
+        scanf("%d", &students[i].roll_no);
+        printf("Grade: ");
+        scanf(" %c", &students[i].grade);
+        printf("Branch: ");
+        scanf("%s", students[i].branch);
+    }
+
+    write_student_records("students.txt", students, n);
+    store_branchwise_records("students.txt");
+
+    printf("Records stored branch-wise in separate files.\n");
+
+    return 0;
+}