Thread: Sum letters in written numbers from 1 to 2008

Hey there. Haven't been coding in a while, but I am doing challenges on DareYourMind.net and can't figure why I do not get the correct answer. I've picked quite a few numbers (~20-30) and calculated by hand the results and I get the same as the output from my program.

Basically, I have to input the total number of letters of all the written numbers from 1 to 2008.

Here's what I have coded, I commented it as much as possible for you guys:

Code:

#include <iostream>

int main()
{
    int total = 0, current = 0, temp = 0;

    for(int i = 1; i < 2009; i++)
    {
        current = 0;

        // if Xxxx is non-zero, then must add "one/two thousand"
        if(i / 1000) current += 11;

        // if xXxx is non-zero, then must add "one...nine"
        // and if xxXX is non-zero, then must add "hundred and"
        // otherwise add "hundred"
        if(i / 100 && ((i / 100) % 10))
        {
            if(i % 100 == 0) current += 7; // hundred
            else current += 10; // hundred and

            temp = (i / 100) % 10;
            switch(temp)
            {
                case 1: case 2: case 6: current += 3; break;
                case 3: case 7: case 8: current += 5; break;
                case 4: case 5: case 9: current += 4; break;
            }
        }

        // if xxXx is non-zero, then add "ten...ninety"
        // separate case for numbers between 11 and 19 for "eleven...nineteen"
        if((i / 10) && ((i / 10) % 10))
        {
            temp = i % 100;
            if(temp > 10 && temp < 20)
            {
                switch(temp)
                {
                    case 11: case 12: current += 6; break;
                    case 16: case 15: current += 7; break;
                    case 17: current += 9; break;
                    case 13: case 18: case 14: case 19: current += 8; break;
                }
            }
            else
            {
                temp = (i / 10) % 10;
                switch(temp)
                {
                    case 1: current += 3; break;
                    case 2: case 3: case 4: case 8: case 9: current += 6; break;
                    case 5: case 6: current += 5; break;
                    case 7: current += 7; break;
                }
            }
        }

        // make sure we're not in the "eleven...nineteen" range
        // and xxxX is non-zero, then add "one...nine"
        if((((i % 100) < 10) || ((i % 100) > 20)) && !(i % 10))
        {
            temp = i % 10;
            switch(temp)
            {
                case 1: case 2: case 6: current += 3; break;
                case 3: case 7: case 8: current += 5; break;
                case 4: case 5: case 9: current += 4; break;
            }
        }
        std::cout << i << " : " << current << "\t";
        total += current;
    }
    std::cout << std::endl << total;
}

Any help is much welcome !

Thanks (: