Add new file

HomeWork1Code

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#define MAX_STUDENTS 100
+#define MAX_RESIDENTS 100
+#define MAX_STRING 50
+
+
+typedef struct {
+    char studentCode[MAX_STRING];
+    char name[MAX_STRING];
+    char idCode[MAX_STRING];
+} Student;
+
+typedef struct {
+    char idCode[MAX_STRING];
+    char city[MAX_STRING];
+} Resident;
+
+
+int loadStudents(Student students[], const char *filename);
+int loadResidents(Resident residents[], const char *filename);
+void showAvailableCities(Resident residents[], int residentCount);
+void toLowerCase(char *str);
+int isCityValid(Resident residents[], int residentCount, const char *inputCity);
+void findAndPrintStudents(Student students[], int studentCount, Resident residents[], int residentCount, const char *inputCity);
+int initializeData(Student students[], int *studentCount, Resident residents[], int *residentCount, char *inputCity);
+
+int main() {
+    Student students[MAX_STUDENTS];
+    Resident residents[MAX_RESIDENTS];
+    int studentCount, residentCount;
+    char inputCity[MAX_STRING];
+
+    
+    if (initializeData(students, &studentCount, residents, &residentCount, inputCity) == -1) {
+        return 1;  
+    }
+
+   
+    findAndPrintStudents(students, studentCount, residents, residentCount, inputCity);
+
+    return 0;
+}
+
+
+int initializeData(Student students[], int *studentCount, Resident residents[], int *residentCount, char *inputCity) {
+    *studentCount = loadStudents(students, "F1.txt");
+    if (*studentCount == -1) return -1;  
+
+    *residentCount = loadResidents(residents, "F2.txt");
+    if (*residentCount == -1) return -1;  
+
+    
+    showAvailableCities(residents, *residentCount);
+
+    
+    while (1) {
+        printf("Enter residence: ");
+        scanf("%s", inputCity);
+        toLowerCase(inputCity);  
+
+        if (isCityValid(residents, *residentCount, inputCity)) {
+            break;  
+        } else {
+            printf("Error: The city '%s' is not in the available list. Try again.\n", inputCity);
+        }
+    }
+
+    return 0; 
+}
+
+
+int loadStudents(Student students[], const char *filename) {
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        printf("Error opening %s\n", filename);
+        return -1;
+    }
+
+    int count = 0;
+    while (fscanf(file, "%s %s %s", students[count].studentCode, students[count].name, students[count].idCode) == 3) {
+        count++;
+        if (count >= MAX_STUDENTS) break; 
+    }
+
+    fclose(file);
+    return count;
+}
+
+
+int loadResidents(Resident residents[], const char *filename) {
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        printf("Error opening %s\n", filename);
+        return -1;
+    }
+
+    int count = 0;
+    while (fscanf(file, "%s %s", residents[count].idCode, residents[count].city) == 2) {
+        toLowerCase(residents[count].city);  
+        count++;
+        if (count >= MAX_RESIDENTS) break; 
+    }
+
+    fclose(file);
+    return count;
+}
+
+
+void showAvailableCities(Resident residents[], int residentCount) {
+    printf("Available cities:\n");
+    for (int i = 0; i < residentCount; i++) {
+        int duplicate = 0;
+        for (int j = 0; j < i; j++) {
+            if (strcmp(residents[i].city, residents[j].city) == 0) {
+                duplicate = 1;  
+                break;
+            }
+        }
+        if (!duplicate) {
+            printf("- %s\n", residents[i].city);
+        }
+    }
+    printf("\n");
+}
+
+
+void toLowerCase(char *str) {
+    for (int i = 0; str[i]; i++) {
+        str[i] = tolower(str[i]);
+    }
+}
+
+
+int isCityValid(Resident residents[], int residentCount, const char *inputCity) {
+    for (int i = 0; i < residentCount; i++) {
+        if (strcmp(residents[i].city, inputCity) == 0) {
+            return 1;  
+        }
+    }
+    return 0; 
+}
+
+
+void findAndPrintStudents(Student students[], int studentCount, Resident residents[], int residentCount, const char *inputCity) {
+    printf("\nStudents in %s:\n", inputCity);
+    int found = 0;
+
+    for (int i = 0; i < residentCount; i++) {
+        if (strcmp(residents[i].city, inputCity) == 0) {  
+            for (int j = 0; j < studentCount; j++) {
+                if (strcmp(students[j].idCode, residents[i].idCode) == 0) {  
+                    printf("%s %s\n", students[j].studentCode, students[j].name);
+                    found = 1;
+                }
+            }
+        }
+    }
+
+    if (!found) {
+        printf("No students found in this city.\n");
+    }
+}