How to convert a number into string i.e. 1234 to one two three without using if or switch statement?

Question

Convert the given string into palindrome with minimum number of appends(at end of the given string). O(n) algorithm will be appreciated ??

Input :=> Malayal
Output :=> Malayalam

Answer 1

When we write 1234 to one two three four then we need to first get 1 followed by 2 and so on. Once we get that its easy we can replace the text as follows -

int main()
{
    int n = 1234;
    char word[][10] = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};

    //  first reversing the number to output from front

    int reverse = 0;
    while (n != 0)
    {
        reverse = reverse * 10;
        reverse = reverse + n%10;
        n = n/10;
    }

    //  now outputting the word

    while (reverse != 0)
    {
        printf("%s ", word[reverse % 10]);
        reverse /= 10;
    }
}