can't get string conversion strtod in c -

could me(sorry english), im trying convert string double when can't here's code(thank you, i'll appreciate much):

#include <stdio.h> #include <string.h> #include <stdlib.h>  #define max_long 5  char bx[max_long]; double cali=0;  int main() { scanf("%c",bx); cali = strtod(bx,null); printf("%f",cali); return 0; } 

when input value greater 10 in output print first number this:

 input: 23  output: 2.00000  input: 564  output: 5.00000 

the scanf() specifier using wrong, unless specify number of characters, array not nul terminated, suggest following

#include <stdio.h> #include <string.h> #include <stdlib.h>  int main()  {     char   bx[6]; /* if want 5 characters, need array of 6                    * because string needs `nul' terminator byte                    */     double cali;     char  *endptr;      if (scanf("%5s", bx) != 1)     {         fprintf(stderr, "`scanf()' unexpected error.\n");         return -1;     }      cali = strtod(bx, &endptr);     if (*endptr != '\0')     {         fprintf(stderr, "cannot convert, `%s' `double'\n", bx);         return -1;     }             printf("%f\n", cali);     return 0; }