帮我写一个c语言银行管理系统

以下是一个简单的C语言银行管理系统的示例：

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

typedef struct {
    int accountNumber;
    char accountName[100];
    double balance;
} BankAccount;

int main() {
    FILE *file;
    int numAccounts;
    BankAccount *accounts;

    // 打开文件
    file = fopen("input.txt", "r");
    if (file == NULL) {
        printf("无法打开文件。\n");
        return 1;
    }

    // 读取账户数量
    fscanf(file, "%d", &numAccounts);

    // 分配内存
    accounts = (BankAccount *)malloc(numAccounts * sizeof(BankAccount));

    // 读取账户信息
    for (int i = 0; i < numAccounts; i++) {
        fscanf(file, "%d %s %lf", &accounts[i].accountNumber, accounts[i].accountName, &accounts[i].balance);
    }

    // 关闭文件
    fclose(file);

    // 打印账户信息
    for (int i = 0; i < numAccounts; i++) {
        printf("账户号码：%d\n", accounts[i].accountNumber);
        printf("账户名称：%s\n", accounts[i].accountName);
        printf("账户余额：%.2lf\n", accounts[i].balance);
        printf("\n");
    }

    // 释放内存
    free(accounts);

    return 0;
}