Sequential File Allocation

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


void recursion(int file[])
{
    int free = 0, block, length, j, k, ch, i;

    printf("Enter the starting block and the length: ");
    scanf("%d%d", &block, &length);
    for (i = block; i < block + length; i++)
    {
        if (file[i] == 0)
        {
            free++;
        }

    }
    if (length == free)
    {
        for (i = block; i < block + length; i++)
        {
            if (file[i] == 0)
            {
                file[i] = 1;
                printf("%d\t%d\n", i, file[i]);
            }
        }
        if (i != (block + length - 1))
        {
            printf("The file is allocated to the disk\n");
        }
    }
    else
    {
        printf("Another File Exists in the Required Block \n");
    }

    printf("Do you want to enter files\n");
    printf("Press 1 for YES, 0 for NO: ");

    scanf("%d", &ch);
    if (ch == 1)
        recursion(file);
    else
        exit(0);
    return;
}
int main()
{
    int file[30], i;

    for (i = 0; i < 30; i++)
    {
        file[i] = 0;
    }

    printf("Files allocated are\n");
    recursion(file);
    getch();
    return 0;
}