UVa 10878 - Decode the tape

# include <stdio.h>
# include <string.h>

char str[15];
char t[8] = {64, 32, 16, 8, 0, 4, 2, 1};

int main()
{
short int i, c;

gets(str);
while (gets(str) != NULL)
{
c = 0;
for (i = 2; i <= 9; ++i)
if (str[i] == 'o') c += t[i-2];
if (c != 0) putchar(c);
}

return 0;
}