Stringovi-Funkcije

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

void input(char *string)
{
    char c;

    while(c = getchar(), c != '\n')
        *(string++) = c;

    *string = '\0';
}

int length(char *string)
{
    int len = 0;
    while(*(string++) != '\0') len++;

    return len;
}

int compare(char *string1, char *string2)
{
    if(length(string1) != length(string2)) return 0;

    while(*(string1) != '\0')
    {
        if(*(string1++)!= *(string2++)) return 0;
    }

    return 1;
}

void cut(char *string, int indeks, int len)
{
    int i;

    for(i = indeks; i <= length(string) - len; i++)
    {
        string[i] = string[i + len];
    }

}

void insert(char *string, char *word, int indeks)
{
    int i;
    for(i = length(string) + length(word); i >= indeks + length(word); i--)
    {
        string[i] = string[i - length(word)];
    }

    for(i = 0; i < length(word); i++)
    {
        string[i + indeks] = word[i];
    }
}

int rastavi(char *string)
{
    int i, count = 0;

    for(i = 0; i < length(string); i++)
    {
        if(string[i] != ' ')
        {
            //pocetak rijeci
            count++;
            while(i < length(string) && string[i] != ' ')
            {
                printf("%c", string[i]);
                i++;
            }
            printf("\n");
            //kraj rijeci
        }
    }

    return count;
}

int toNum(char *string)
{
    int i, num = 0, k = 1;

    for(i = length(string) - 1; i >= 0; i--)
    {
        num += (string[i] - '0') * k;
        k *= 10;
    }

    return num;
}

int find(char *string, char *word)
{
    int i, j;
    int ima;

    for(i = 0; i < length(string) - length(word); i++)
    {
        ima = 1;
        for(j = 0; j < length(word); j++)
        {
            if(string[i + j] != word[j])
            {
                ima = 0;
                break;
            }
        }

        if(ima) return i;
    }

    return -1;
}

void concate(char *string1, char *string2)
{
    int i;

    for(i = 0; i <= length(string2); i++)
        string1[i + length(string1)] = string2[i];
}

int main()
{
    char string[100];
    char word[20];

    input(string);
    printf("%s\n", string);
    printf("len: %d\n", length(string));
    input(word);

    printf("indeks: %d\n", find(string, word));

    return 0;
}