POO

#include <stdio.h>
#include <stdlib.h>

int convertString(char s[]);
bool isLetter(char s);
void swapWords(char a[], char b[]);
int length(char s[]);
void coppy(char a[], char b[]);
bool isSmaller(char a[], char b[]);

int main()
{
    /*
    FILE* fs;
    fs = fopen("in.txt", "r");
    char string[11];
    int sum = 0;
    while(fgets(string, 11, fs))
        sum += convertString(string);
    fclose(fs);
    printf("Suma este egala cu %d.", sum);*/
    char string[100], words[10][100], j=0, nrOfWords=0;
    scanf("%[^\n]", string);
    for (int i = 0; string[i]; i++)
    {
        if (isLetter(string[i]))
        {
            words[nrOfWords][j] = string[i];
            j++;
        }
        else
        {
            words[nrOfWords][j] = 0;
            nrOfWords++;
            j = 0;
        }
    }
    words[nrOfWords][j] = 0;
    for (int i = 0; i < nrOfWords; i++)
    {
        for (int j = i + 1; j <= nrOfWords; j++)
            if (length(words[i]) < length(words[j]))
                swapWords(words[i], words[j]);
            else
                if (length(words[i]) == length(words[j]) && isSmaller(words[i], words[j]))
                    swapWords(words[i], words[j]);

    }
    for (int i = 0; i <= nrOfWords; i++)
        printf("%s\n", words[i]);
    return 0;
}

int convertString(char s[]) ///123
{
    int nr = 0;
    for (int i = 0; s[i]; i++)
        if (s[i] >= '0' && s[i] <= '9')
            nr = nr * 10 + (s[i] - '0');
    return nr;
}

bool isLetter(char s)
{
    return (s >= 'a' && s <= 'z') || (s >= 'A' && s <= 'Z');
}

int length(char s[])
{
    int nr = 0;
    for (int i = 0; s[i]; i++)
        nr++;
    return nr;
}

void swapWords(char a[], char b[])
{
    char aux[100];
    coppy(aux, a);
    coppy(a, b);
    coppy(b, aux);
}

void coppy(char a[], char b[])
{
    int i;
    for (i = 0; b[i]; i++)
        a[i] = b[i];
    a[i] = 0;
}

bool isSmaller(char a[], char b[])
{
    for (int i = 0, j = 0; a[i] && b[i]; i++, j++)
        if (a[i] < b[i])
            return 1;
    return 0;
}