123123

list.c

#include <stdio.h>
#include <stdlib.h>

typedef struct {
        char last_name[20];
        char first_name[20];
        char team[20];
        char sports_type[20];
        int all_pts;
        int penalty_pts;
} fields;

typedef struct comp {
        fields f;
        struct comp * next;
} competition; 

//definitions
competition * list_head = NULL;
char file_name[] = "backup.txt";

void f_print(void);
void f_input(void);
void f_add(competition *);
void f_delete(void);
void f_change(void);
//void f_sort_1();
//void f_sort_2();
void f_save(void);
void f_restore(void); //not_working
//end of definitions

void f_sort_1() {
    if (list_head == NULL) {
        printf("List is empty.\n");
        return;    
    }
    competition * current = list_head, * next;
    int length=0;
    do {
        length++;
    } while ((current = current->next) != NULL);
    int i;
    for (i=0;i<length;++i) {
        current = list_head;
        next = current->next;
        do {
            if (current->f.all_pts > next->f.all_pts) {
                fields swap = current->f;
                current->f = next->f;
                next->f = swap;
            }
            current = current->next;
            next = current->next; 
            
        } while (next != NULL);
    } 
}

void f_input() {
    while (1) {
        competition * new_element = malloc(sizeof(competition));
        printf("Enter first name: \n");
        scanf(" %[^\n]", new_element->f.first_name);
        printf("Enter last name: \n");
        scanf(" %[^\n]", new_element->f.last_name);
        printf("Enter team: \n");
        scanf(" %[^\n]", new_element->f.team); 
        printf("Enter sports type: \n");
        scanf(" %[^\n]", new_element->f.sports_type);
        printf("Enter summary pts: \n");
        scanf(" %d", &new_element->f.all_pts); 
        printf("Enter penalty pts: \n");
        scanf(" %d", &new_element->f.penalty_pts); 
        new_element->next = NULL;
        f_add(new_element); //add element to list
        printf("DO YOU HAVE AGAIN?!! (y/n)\n");
        char answer;
        scanf(" %c", &answer);
        if (answer != 'y') return;
    }
}

void f_add(competition * el) {
    if (list_head == NULL) {
        list_head = el; 
    } else {
        competition * temp = list_head;
        while (temp->next != NULL) temp = temp->next;
        temp->next = el;   
    }
}

void f_print() {
    if (list_head == NULL) {
        printf("List is empty.\n");
        return;    
    }
    int limit = 10;
    int index = 0;
    competition * temp = list_head;
    do {
        ++index;
        printf("%10s|%10s|%10s|%10s|%5d|%5d|\n",
            temp->f.first_name,
            temp->f.last_name,
            temp->f.team,
            temp->f.sports_type,
            temp->f.all_pts,
            temp->f.penalty_pts); 
        if (index == limit) {
            index = 0;
            system("pause");    
        }   
    } while ((temp = temp->next) != NULL);    
}

void f_delete(void) {
    if (list_head == NULL) {
        printf("List is empty.\n");
        return;    
    }
    int id, cur_pos = 0;
    printf("Enter number element: \n");
    scanf(" %d", &id);
    competition * current = list_head; 
    competition * previously = NULL;
    if (id == 0) {
        if (current->next != NULL) 
            list_head = current->next;
        else 
            list_head = NULL;
        free(current);
        return;       
    }
    do {
        if (id == cur_pos) {
            previously->next = current->next;
            free(current);   
            break;     
        }
        previously = current;
        current = current->next; 
        cur_pos++;  
    } while (current != NULL); 
    if (id != cur_pos) {
        printf("ERR: NOT FOUND ELEMENT WITH ENTERED ID.\n");    
    }  
}

void f_change(void) {
    if (list_head == NULL) {
        printf("List is empty.\n");
        return;    
    }
    int id, cur_pos = 0;
    printf("Enter number element: \n");
    scanf(" %d", &id);
    competition * current = list_head; 
    do {
        if (id == cur_pos) {
            printf("Old values: \n");
            printf("%10s|%10s|%10s|%10s|%5d|%5d|\n",
                current->f.first_name,
                current->f.last_name,
                current->f.team,
                current->f.sports_type,
                current->f.all_pts,
                current->f.penalty_pts);
            system("pause");
            printf("Enter new values: \n\n");
            printf("Enter first name: \n");
            scanf(" %[^\n]s", current->f.first_name);
            printf("Enter last name: \n");
            scanf(" %[^\n]s", current->f.last_name);
            printf("Enter team: \n");
            scanf(" %[^\n]s", current->f.team); 
            printf("Enter sports type: \n");
            scanf(" %[^\n]s", current->f.sports_type);
            printf("Enter summary pts: \n");
            scanf(" %d", &current->f.all_pts); 
            printf("Enter penalty pts: \n");
            scanf(" %d", &current->f.penalty_pts); 
            break;     
        }
        current = current->next; 
        cur_pos++;  
    } while (current != NULL); 
    if (id != cur_pos) {
        printf("ERR: NOT FOUND ELEMENT WITH ENTERED ID.\n");    
    } 
}

void f_save(void) {
    if (list_head == NULL) {
        printf("List is empty. Nothing to save.\n");
        return;    
    } 
    FILE * backup = fopen(file_name, "w");
    competition * temp = list_head;
    do {
        fprintf(backup, "%s|%s|%s|%s|%d|%d|\n",
            temp->f.first_name,
            temp->f.last_name,
            temp->f.team,
            temp->f.sports_type,
            temp->f.all_pts,
            temp->f.penalty_pts); 
    } while ((temp = temp->next) != NULL);  
    fclose(backup);           
}

void f_restore(void) {
    list_head == NULL; //TO-DO: free all list
    FILE * backup = fopen(file_name, "r");
    competition * temp = malloc(sizeof(competition));
    while (fscanf(backup, " %[^|]s %[^|]s %[^|]s %[^|]s %d %d\n", temp->f.first_name, temp->f.last_name, temp->f.team, temp->f.sports_type,  &temp->f.all_pts, &temp->f.penalty_pts) != EOF) {
                 printf("%10s|%10s|%10s|%10s|%5d|%5d|\n",
                temp->f.first_name,
                temp->f.last_name,
                temp->f.team,
                temp->f.sports_type,
                temp->f.all_pts,
                temp->f.penalty_pts);
     system("pause");            
    } 
 
    fclose(backup);           
}

int main() {
    while (1) {
        struct mn {
            char desc[100];
            void (*go)();
        } menu[] = {
            {"Add to list (console I/O)", f_input},
            {"View list (console I/O)", f_print},
            {"Save list", f_save},
            {"Restore list", f_restore},
            {"Delete element", f_delete},
            {"Sort by index field", f_sort_1}, 
            {"Change values", f_change}
        };
        int menu_cnt = 6, i;
        for (i=0;i<menu_cnt;++i) {
            printf("%d : %s\n", i, menu[i].desc);    
        }
        printf("Choose your destiny: ");
        int choose;
        scanf(" %d", &choose);
        menu[choose].go();
    }
    return 0;    
}