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HW1code.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_STUDENTS 100
+#define MAX_RESIDENTS 100
+#define MAX_LENGTH 100
+
+// Define the structures
+typedef struct {
+    char student_code[MAX_LENGTH];
+    char name[MAX_LENGTH];
+    char id_code[MAX_LENGTH];
+} Student;
+
+typedef struct {
+    char id_code[MAX_LENGTH];
+    char city[MAX_LENGTH];
+} Resident;
+
+// Function to read students from F1.txt
+int read_students(const char *file_name, Student students[]) {
+    FILE *file = fopen(file_name, "r");
+    if (file == NULL) {
+        perror("Error opening file");
+        return -1;
+    }
+
+    int count = 0;
+    while (fscanf(file, "%[^,],%[^,],%s\n", students[count].student_code, students[count].name, students[count].id_code) != EOF) {
+        count++;
+    }
+
+    fclose(file);
+    return count;
+}
+
+// Function to read residents from F2.txt
+int read_residents(const char *file_name, Resident residents[]) {
+    FILE *file = fopen(file_name, "r");
+    if (file == NULL) {
+        perror("Error opening file");
+        return -1;
+    }
+
+    int count = 0;
+    while (fscanf(file, "%[^,],%s\n", residents[count].id_code, residents[count].city) != EOF) {
+        count++;
+    }
+
+    fclose(file);
+    return count;
+}
+
+// Main function
+int main() {
+    Student students[MAX_STUDENTS];
+    Resident residents[MAX_RESIDENTS];
+
+    int student_count = read_students("F1.txt", students);
+    int resident_count = read_residents("F2.txt", residents);
+
+    if (student_count == -1 || resident_count == -1) {
+        return 1;
+    }
+
+    char residence[MAX_LENGTH];
+    printf("Enter the residence: ");
+    scanf("%s", residence);
+
+    // Find matching students
+    int found = 0;
+    for (int i = 0; i < student_count; i++) {
+        for (int j = 0; j < resident_count; j++) {
+            if (strcmp(students[i].id_code, residents[j].id_code) == 0 && strcmp(residents[j].city, residence) == 0) {
+                if (!found) {
+                    printf("Students with residence %s:\n", residence);
+                    found = 1;
+                }
+                printf("Student Code: %s, Name: %s, ID Code: %s\n", students[i].student_code, students[i].name, students[i].id_code);
+            }
+        }
+    }
+
+    if (!found) {
+        printf("No students found with the given residence.\n");
+    }
+
+    return 0;
+}