C, 160 bytes
g(char*s){char i=1,r=0,*p="k^[#>Pcx.yI<7CZpVgmH:o]sYK$2";for(;*s^'-'&&*s;r+=*s++|9);r=r%45+77;for(;*p!=r;p++,i++);return((*s^'-')?0:g(s+1))+(i<21?i:10*(i-18));}
Test it
#C, 160 bytes
int main ()
{
char* w[] = {"", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty", "twenty-one", "twenty-two", "twenty-three", "twenty-four", "twenty-five", "twenty-six", "twenty-seven", "twenty-eight", "twenty-nine", "thirty", "thirty-one", "thirty-two", "thirty-three", "thirty-four", "thirty-five", "thirty-six", "thirty-seven", "thirty-eight", "thirty-nine", "forty", "forty-one", "forty-two", "forty-three", "forty-four", "forty-five", "forty-six", "forty-seven", "forty-eight", "forty-nine", "fifty", "fifty-one", "fifty-two", "fifty-three", "fifty-four", "fifty-five", "fifty-six", "fifty-seven", "fifty-eight", "fifty-nine", "sixty", "sixty-one", "sixty-two", "sixty-three", "sixty-four", "sixty-five", "sixty-six", "sixty-seven", "sixty-eight", "sixty-nine", "seventy", "seventy-one", "seventy-two", "seventy-three", "seventy-four", "seventy-five", "seventy-six", "seventy-seven", "seventy-eight", "seventy-nine", "eighty", "eighty-one", "eighty-two", "eighty-three", "eighty-four", "eighty-five", "eighty-six", "eighty-seven", "eighty-eight", "eighty-nine", "ninety", "ninety-one", "ninety-two", "ninety-three", "ninety-four", "ninety-five", "ninety-six", "ninety-seven", "ninety-eight", "ninety-nine", "one hundred"};
int n;
for (n = 1; n <= 100; n++)
{
printf ("%s -> %d\n", w[n], g(w[n]));
if (n != g(w[n]))
{
printf ("Error at n = %d", n);
return 0;
}
}
return 0;
}
g(char*s){char i=1,r=0,*p="k^[#>Pcx.yI<7CZpVgmH:o]sYK$2";for(;*s^'-'&&*s;r+=*s++|9);r=r%45+77;for(;*p!=r;p++,i++);return((*s^'-')?0:g(s+1))+(i<21?i:10*(i-18));}
How it works
#Test it int main () { char* w[] = {"", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty", "twenty-one", "twenty-two", "twenty-three", "twenty-four", "twenty-five", "twenty-six", "twenty-seven", "twenty-eight", "twenty-nine", "thirty", "thirty-one", "thirty-two", "thirty-three", "thirty-four", "thirty-five", "thirty-six", "thirty-seven", "thirty-eight", "thirty-nine", "forty", "forty-one", "forty-two", "forty-three", "forty-four", "forty-five", "forty-six", "forty-seven", "forty-eight", "forty-nine", "fifty", "fifty-one", "fifty-two", "fifty-three", "fifty-four", "fifty-five", "fifty-six", "fifty-seven", "fifty-eight", "fifty-nine", "sixty", "sixty-one", "sixty-two", "sixty-three", "sixty-four", "sixty-five", "sixty-six", "sixty-seven", "sixty-eight", "sixty-nine", "seventy", "seventy-one", "seventy-two", "seventy-three", "seventy-four", "seventy-five", "seventy-six", "seventy-seven", "seventy-eight", "seventy-nine", "eighty", "eighty-one", "eighty-two", "eighty-three", "eighty-four", "eighty-five", "eighty-six", "eighty-seven", "eighty-eight", "eighty-nine", "ninety", "ninety-one", "ninety-two", "ninety-three", "ninety-four", "ninety-five", "ninety-six", "ninety-seven", "ninety-eight", "ninety-nine", "one hundred"};
int n;
for (n = 1; n <= 100; n++)
{
printf ("%s -> %d\n", w[n], g(w[n]));
if (n != g(w[n]))
{
printf ("Error at n = %d", n);
return 1;
}
}
return 0;
}
After#How it works
After some attempts, I found a function that sendsmaps the "exceptional" numbers one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety, one hundred, to the printable ASCII characters k, ., [, <, *, , c, K, w, y, e, (, S, _, -, C, ), 7, =, 4, &, o, ], s, Y, g, m, N, respectively.
char hash (char* s)
{
char r = 0;
while (*s)
{
r += *s|9;
s++;
}
return r%45+77;
}
char hash (char* s)
{
char r = 0;
while (*s)
{
r += *s|9;
s++;
}
return r%45+77;
}
