Trouble with pointers in C code

Trouble with pointers in C code

Language: C
Global variables
char array[1001]={0};
char result[1001]={0};
//main()
//lasta - index of last element in array[], lastr - index for result[]
//larr - pointer to larger array (array[] or result[])
//bint - pointer to bigger of lasta or lastr, sint - smaller
int i = 0, lasta = 0, lastr = 0, overflow = 0;
char *larr, *sarr;
int *bint, *sint;
scanf("%s", array); //init arrays - ok
scanf("%s", result);
//some routines, include output of arrays, whitch don't modify global arrays
//...
// next 3 lines is just debug output. No troubles, all correct
printf("\narray: %s\n", array);
printf("\nresult: %s\n", result);
printf("\nlasta = %d, lastr = %d, arr[lasta]=%d, res[lastr]=%d\n", lasta,
lastr, array[lasta], array[lastr]);
if (lasta > lastr)
{
larr = array;
sarr = result;
bint = &lasta;
sint = &lastr;
}
else
{
larr = result;
sarr = array;
bint = &lastr;
sint = &lasta;
}
putc('5', stdout); // no ouput: Segmentation fault (core dumped)
If i modify if-else blocks in such way:
larr = array;
putc('5', stdout);
sarr = result;
putc('5', stdout);
bint = &lasta;
putc('5', stdout);
sint = &lastr;
putc('5', stdout);
there is no "Segmentation fault." more
What's wrong with pointers?
p.s. System: FreeBSD 9.1, compilers: gcc 4.6, gcc 4.9, clang