Huawei interview question number case conversion

This problem because the limit of 4 digits, so only consider the case of 4 digits, eat share a case conversion source code, there are unlimited number of cases, debugging was very painful, the idea is similar.

void iConvert(int digit)
{
    char a[5][10] = {" thousand "," best "," ten ",""," zero "};
    char b[11][10] = {" zero "," one "," two "," three "," four "," five "," six "," seven "," eight "," nine "," ten "};
    char result[50] = {'0'};
    int A[4] = {};
    for(int i=3;i>=0;i--)
    {
        A[i] = digit % 10;
        digit = int(digit/10);
    }
    printf("%d,%d,%d,%dn",A[0],A[1],A[2],A[3]);
    int foundZero = 0;
    for(int i = 0 ;i<4;i++)
    {
        if(A[i]>0)
        {
            strcat(result,b[A[i]]);
            strcat(result,a[i]);
        }
        if(A[i]==0 && foundZero == 0)
        {
           if(i!=3)//If it is not the last digit, zero is not appended
           {
             strcat(result,a[4]);
             foundZero = 1;
           }
        }    
    }
    puts(result);
}
 Operation results: