Gtk+

i am developing a calculator in C using GTK+, the code below activates when the cosine button is clicked. i can read the text from the textview, but don't know how to assign the data in text to a char array. i would be grateful for any assistance.

Code:

---

static gchar str[] = "";
static num1;
on_BTN_COS_clicked(GtkButton      *button,
                                        gpointer        user_data)
{

        GtkWidget *resultfld;
        gchar *text;
        resultfld = GTK_ENTRY(lookup_widge(button, "entry1"));

        text = gtk_entry_get_text(resultfld);

???????        str == text; /// need to asign data in *text to str[] ?????

       
        num1 = strtod( str, &p);
        num1 = cos(num1);
        sprintf(str,"%f",num1);

        gtk_entry_set_text(resultfld, str);
}

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make sure you have enough memory allocated and use memcpy()

use g_strcpy () for copying characters from array to other
instead of using strtod use g_strtod () or g_ascii_strtod()
replace sprintf to g_sprintf () and ...
check glib manual, it tells you more information about these.