foo.c

   1 #include <stdio.h>
   2 int main(int arg, char *argv[])
   3 {
   4         int j;
   5         for (j=0; j<256; j++) {
   6                 signed char j2=(signed char)j;
   7                 printf("%4d ", (signed int)j2);
   8         }
   9         printf("\n");
  10         return 0;
  11 }