Thread: called object is not a function

I have two structs in a header file.In the first one i have an array that's type is of the second struct. Something like this

Code:

typedef struct transaction {
    int type;
        char name[40];                                
    int moment;                    
} transaction;

typedef struct account {
...
transaction pinakas[20];
...
} account;

And i want to call sprintf function to to write some data like this

Code:

 sprintf(t," &s", sm_data->pinakas(i).name);

and i'm getting this error i'm mentioning in the thread's title.Any help"????

thank you so much!!!!