结构和功能 [暂停]

Question

bank* b1 = bank_constructor("BankA", 3);

In this part, program gives me an eror that is initialization makes pointer from integer without a cast. How can I solve this problem.

This is full part of my code;

#include<stdio.h>
#include<locale.h>
#include<windows.h>
#include<string.h>

typedef struct
{
    char        name;
    int         password;
    int         amoount;
    int         accyear;
}account;

typedef struct 
{
    char        name;
    int         maxacc;
    int         curacc;
    account**   allacc;
}bank;

bank* bank_construtor(char *name, int maxacc);

int main()
{
    bank* b1 = bank_constructor("BankA", 3);    
}

bank* bank_construtor(char *name, int maxacc)
{
    bank* ret = (bank*) calloc(1, sizeof(bank*));
    strcpy(ret->name,*name);
    strcpy(ret->name,maxacc);
    return ret;
}

Answer 1

You have multiple problems with the bank_construtor function.

• You attempt to copy single characters with a function for copying strings:

   strcpy(ret->name,*name);

  ret->name and *name are both single characters and strcpy copies strings ("arrays" of characters).

• You can't use strcpy to copy or create or append numbers to strings (or in your case single characters). So the statement

  strcpy(ret->name,maxacc);

  doesn't make any sense.

• calloc(1, sizeof(bank*)) allocates memory for a pointer to a bank structure, not enough memory for a full bank structure itself. You should use sizeof(bank) .

• You don't include <stdlib.h> which properly declares the calloc functions. That means your call and the value returned could be invalid. This is the reason one should not cast the return of malloc , calloc or similar functions .

• You call the bank_constructor but declare and define the bank_construtor function. Not the same name function. This typo could be the one that leads to the error you ask about.