need help in structure assigning value from struct member to outside the structure

[aliaj00]

i have the code bellow, and i print the data but cannot assign it to global variable. any help with be much appreciated.

struct frequency_data
{
 char frequency[10];
 int32 frequenca_mesatare;
 int16 PWM_F;
 int32 PR2;
 int16 Duty_Cycle;
};
void display(struct frequency_data FRQ)
{
   printf(" Output\nName: %s",FRQ.frequency);
}
void main()
{
char koli[10];
 
struct frequency_data *test;
 
   struct frequency_data s1;
   printf( "Enter Frequency:  ");
   gets(&s1.frequency);
   test =&s1;
    koli = test->frequency;does not work
    printf("koli eshte :   %s",test->frequency ); works
    koli = *test.frequency; does not work
    printf("koli eshte :   %s",koli );
    //test = (char*)s1.frequency;
    //printf ("-.....-: %s",test);
   //printf(" Output\nName: %s",&my_struct_pointer.frequency);
  //display(s1);
}

[weaknessforcats]

Think about this.

koli is a char array in main(). Remember that the name of an array is the address of element 0. So koli is the address of koli[0].

s1.frequency is a char array in s1. Again, the name of an array is the address of element 0. So s1.frequency is the address of s1.frequency[0].

So your code:

koli = test->frequency;does not work

is really trying to assign the address of the array
s1.frequency[10] to the address of koli[10]. The compiler won't let you change the address of a local variable.

Replace this line of code with a loop that copies the 10 elements of s1.frequency[10] to koli[10] one at a time:

for (int i = 0; i<10; ++i)
{
     koli[i] = s1.frequency[i];
}

koli[i] is a char. s1.frequency[i] is a char. The code assigns a char to a char, which is always OK.

[aliaj00]

thanks a lot i will try this one out :)

BR,

Aliaj00

[aliaj00]

HI weaknessforcats

thanks a lot it worked but i just assigned it like:

koli[0] = test->frequency; //failing to get the value from test.frequency to koli if i comment it out the code works
 
    printf("koli eshte :   %s",koli[0] );

and it worked.

thanks again,

BR,

Aliaj00

[weaknessforcats]

There are two array syntaxes: a) brackets [] and b)pointers ->. You use brackets with the actual elements and you use pointers with the addresses of the elements:

struct data
{
   int values[10];
};
 
int main()
{
data  stuff[10];
    stuff[2].values[5] = 2;   //use the actual stuff element
 
    (stuff + 2)->values[5] = 2;    //use the address of the stuff element
 
 
}

Using the array syntax ([...]) is preferred to the pointer syntax (->)

[aliaj00]

thanks i will keep it in mind :).