CashBox

程设课的一个小玩具。

/**
 * Copyright 2017 Neopolitan
 */

#include <cstdio>
#include <algorithm>

using namespace std;

#define SIZE 100
#define CASH sizeof(cash)

struct cash{
    int date;
    int entry_or_expenditure;
};

cash list[SIZE];
int tail;

bool cmp(cash a, cash b){
    return a.date < b.date;
}

void cash_insert(){
    if (tail >= SIZE){
        printf("Failed to insert. The storage is full.
");
        return;
    }
    printf("Date:
");
    scanf("%d", &list[tail].date);
    printf("Entry(+) or Expenditure(-):
");
    scanf("%d", &list[tail].entry_or_expenditure);
    tail += 1;
    sort(list, list + tail, cmp);
    printf("Successfully inserted.
");
}

void cash_search(int id){
    if (id >= tail){
        printf("Not found.
");
        return;
    }
    int balance = 0;
    printf("ID: %d
", id);
    printf("Date: %08d
", list[id].date);
    printf("Entry(+) or Expenditure(-): %d
", list[id].entry_or_expenditure);
    for (int i = 0; i <= id; i++)
        balance += list[i].entry_or_expenditure;
    printf("Balance: %d
", balance);
}

void cash_delete(int id){
    if (id >= tail){
        printf("Not found.
");
        return;
    }
    tail -= 1;
    for (int i = id; i < tail; i++){
        list[i].date = list[i + 1].date;
        list[i].entry_or_expenditure = list[i + 1].entry_or_expenditure;
    }
    printf("Successfully deleted.
");
}

void cash_change(int id){
    if (id >= tail){
        printf("Not found.
");
        return;
    }
    printf("Date:
");
    scanf("%d", &list[id].date);
    printf("Entry(+) or Expenditure(-):
");
    scanf("%d", &list[id].entry_or_expenditure);
    sort(list, list + tail, cmp);
    printf("Successfully changed.
");
}

void cash_print(){
    for (int i = 0; i < tail; i++)
        cash_search(i);
}

int main(){
    int i = 0;
    cash file_input;
    FILE *fp = fopen("cashbox.neo", "ab+");
    if (fp == nullptr){
        printf("Failed to open the file.");
        exit(0);
    }
    while (fread(&list[i], CASH, 1, fp) != 0)
        i += 1;
    sort(list, list + i, cmp);
    tail = i;
    int input, id;
    while (printf("1: Insert; 2:Search; 3:Delete; 4:Change; 5:Print; 0:Exit
"), scanf("%d", &input), input != 0){
        switch (input){
            case 1:
                cash_insert();
                break;
            case 2:
                printf("ID:
");
                scanf("%d", &id);
                cash_search(id);
                break;
            case 3:
                printf("ID:
");
                scanf("%d", &id);
                cash_delete(id);
                break;
            case 4:
                printf("ID:
");
                scanf("%d", &id);
                cash_change(id);
                break;
            case 5:
                cash_print();
                break;
            default:
                printf("Input error.");
                break;
        }
    }
    if (fclose(fp)){
        printf("Failed to close the file.");
        exit(0);
    }
    fp = fopen("cashbox.neo", "wb+");
    fwrite(list, CASH, tail, fp);
    if (fclose(fp)){
        printf("Failed to close the file.");
        exit(0);
    }
    return 0;
}