How to fill a global array of structures in c-CodePudding

this is the definition and declaration of the structure

typedef struct ST_accountsDB_t
{
    float balance;
    uint8_t primaryAccountNumber[20];
}ST_accountsDB_t;
ST_accountsDB_t accountsDB[255];

then I started filling it

    accountsDB[0].balance = 20000;
    accountsDB[0].primaryAccountNumber[20] = "1234567891234567";
    accountsDB[1].balance = 50000;
    accountsDB[1].primaryAccountNumber[20] = "9872653461728839";
    accountsDB[2].balance = 40000;
    accountsDB[2].primaryAccountNumber[20] = "6873645738467382";
    accountsDB[3].balance = 28000;
    accountsDB[3].primaryAccountNumber[20] = "3872634547838276";
    accountsDB[4].balance = 3000;
    accountsDB[4].primaryAccountNumber[20] = "1283764957873637";
    accountsDB[5].balance = 100000;
    accountsDB[5].primaryAccountNumber[20] = "3485793029384758";
    accountsDB[6].balance = 30000;
    accountsDB[6].primaryAccountNumber[20] = "8746330283748393";

this is the normal way to fill a string right ? why isn't it working ? am I missing something ?

CodePudding user response：

You want the compiler to fill-in a character array from a string. Don't make it difficult for everyone. Copy/paste/adapt is NOT the way to develop code.

typedef struct ST_accountsDB_t {
    float balance;
    char primaryAccountNumber[20]; // NB char, not uint8_t
} ST_accountsDB_t;

ST_accountsDB_t accountsDB[] = {
    {  20000.0, "1234567891234567", },
    {  50000.0, "9872653461728839", },
    {  40000.0, "6873645738467382", },
    {  28000.0, "3872634547838276", },
    {   3000.0, "1283764957873637", },
    { 100000.0, "3485793029384758", },
    {  30000.0, "8746330283748393", },
};

And, using the dimension 255 suggests you've spent the time counting... The compiler counts more accurately than most humans.

CodePudding user response：

You can initialize it when you declare it, using an initialization list.

ST_accountsDB_t accountsDB[255] = {
    {20000, "1234567891234567"},
    {50000, "9872653461728839"},
    ...
};

If you want to fill it in after declaring it, use strcpy() to copy strings.

strcpy(accountsDB[0].primaryAccountNumber, "1234567891234567");

Even though uint8_t is equivalent to unsigned char, it's conventional to use char arrays to declare strings.

typedef struct ST_accountsDB_t
{
    float balance;
    unsigned char primaryAccountNumber[20];
}ST_accountsDB_t;