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#include <stdio.h>
// Only works for positive numbers so far!
char *
snafu(char * dest, size_t len, long n)
{
size_t i = 0, j;
// Build string in reverse.
while (n && i < len) {
int d = n % 5;
switch (d) {
case 0:
case 1:
case 2:
dest[i++] = '0' + d;
break;
case 3:
dest[i++] = '=';
n += 5;
break;
case 4:
dest[i++] = '-';
n += 5;
break;
}
n /= 5;
}
dest[i] = '\0';
// Reverse string to be right way around
for (j = 0; j < i / 2; ++j) {
char tmp = dest[j];
dest[j] = dest[i - 1 - j];
dest[i - 1 - j] = tmp;
}
return dest;
}
int
main()
{
long i = 0, total = 0;
int c;
char buf[BUFSIZ];
while ((c = fgetc(stdin)) != EOF) {
switch (c) {
case '2':
i *= 5;
i += 2;
break;
case '1':
i *= 5;
i += 1;
break;
case '0':
i *= 5;
break;
case '-':
i *= 5;
i -= 1;
break;
case '=':
i *= 5;
i -= 2;
break;
case '\n':
#if 0
fprintf(stderr, "%s (%ld)\n", snafu(buf, sizeof(buf), i), i);
#endif
total += i;
i = 0;
break;
default:
fprintf(stderr, "Unexpected input: %c\n", c);
return -1;
}
}
printf("Total: %s (%ld)\n", snafu(buf, sizeof(buf), total), total);
return 0;
}
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