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我已经编写了一个基本的ATM机程序，其中包含创建帐户，检查余额，进行交易等功能，但还没有完成。我使用文件来存储数据并读取它。读取_account函数，write_account函数用于创建新帐户，no_of_accounts函数用于获取文件中所有正常工作的帐户数量。问题在于find_account_number，它应该以帐号为参数，并返回帐号所在的索引。

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

#define MAX_act 100 
typedef struct{
    long account_number;
    int CVV;
    int PIN;
    float balance;
    long phone_number;
} act;

void write_account(long account_number, int CVV, int PIN, long phone_number)
{
    FILE *f;
    act *account = (act*) malloc(sizeof(act));
    f = fopen("account_data", "a");
    *account = (act) { account_number, CVV, PIN, 0, phone_number};
    fprintf(f, "%ld %d %d %.2f %ld\n", account->account_number, account->CVV, account->PIN, account->balance, account->phone_number);
    fclose(f);
}

act* read_accounts(void){
    FILE *f;
    int i = 0;
    f = fopen("account_data", "r");
    act *accounts = (act*) malloc(sizeof(act)*MAX_act);
    while(fscanf(f, "%ld %d %d %f %ld", &accounts[i].account_number, &accounts[i].CVV, &accounts[i].PIN, &accounts[i].balance, &accounts[i].phone_number) == 5){
    i++;
    }
    fclose(f);
    return accounts;
}

int no_of_accounts(void){
    FILE *f;
    int i = 0;
    act *accounts;
    f = fopen("account_data", "r");
    while(fscanf(f, "%ld %d %d %f %ld", &accounts->account_number, &accounts->CVV, &accounts->PIN, &accounts->balance, &accounts->phone_number) == 5)
    i++;
    free(accounts);
    return i;
}

int find_account_no(long account_number, int no_of_accounts, act *accounts){
    int i = 0;
    act *account = accounts;
    printf("yes, it's called\n");
    for(i=0; i< no_of_accounts; i++){
        printf("%ld\n", account[i].account_number);
        if(account[i].account_number == account_number)
        return i;
    }
    return -1;
}

int main(){
    //write_account(123, 111, 222, 939);
    //write_account(321, 111, 222, 939);
    //write_account(123, 111, 222, 939);

    find_account_no(123, no_of_accounts(), read_accounts());
    printf("%d\n", no_of_accounts());
}

所以在函数find_account_number中，我传递了一个帐号，没有0f accounts和一个指向数组的指针，其中使用read_accounts函数存储帐户数据。bug在哪里？输出不是。