c - Conversion with _itoa -

conversion of values in structure _itoa in example below not successful. see mistake made?

/* typedef struct struct_rect {   int x;   int y;   int w;   int h; }rectangle;  struct struct_objects {   int sort;   rectangle rect;   allegro_color color; }objects[1000];  int number_of_objects = 2; */  bool print_objects() {   char value_string[100];   int i;    (i = 0; < number_of_objects; i++)   {     memset(value_string, '\0', sizeof(value_string));     _itoa(objects[i].sort, value_string, 30);        printf("%i x %s\n", objects[i].sort, value_string);      memset(value_string, '\0', sizeof(value_string));     _itoa(objects[i].rect.x, value_string, 30);      printf("%i x %s\n", objects[i].rect.x, value_string);      memset(value_string, '\0', sizeof(value_string));     _itoa(objects[i].rect.y, value_string, 30);      printf("%i x %s\n", objects[i].rect.y, value_string);      memset(value_string, '\0', sizeof(value_string));     _itoa(objects[i].rect.w, value_string, 30);      printf("%i x %s\n", objects[i].rect.w, value_string);      memset(value_string, '\0', sizeof(value_string));     _itoa(objects[i].rect.h, value_string, 30);      printf("%i x %s\n", objects[i].rect.h, value_string);   }  return true; } 

output is(values in left column correct, in right column not):

0 x 0
20 x k
50 x 1k
50 x 1k
50 x 1k

0 x 0
150 x 50
300 x a0
20 x k
200 x 6k

the output correct. getting result in base₃₀.

for ex: in base₃₀, 300₁₀ = a0₃₀.

arguments of function _itoa are:

1. number converted
2. destination string
3. radix

you giving radix 30, output printed @ base 30.

you should call function as:

_itoa(objects[i].sort, value_string, 10); 

to decimal output.

it quite easy confused 3^rd , assume size o string first time users of function. avoid such consequences, prefer sprintf

sprintf(value_string, "%d", objects[i].sort);