#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <stdbool.h>
#include <limits.h>


int main( void )
{
    unsigned sum = 0;
    int num = -1, temp = 0, decimalNumber = 0, progress = 1;
    size_t counter, counter2;
    bool sentinel = false;


    while( !sentinel ) {

        puts( "Enter number:" );
        scanf( "%d", &num );

        if ( num < 0 ) {
            puts( "Value entered is incorrect. Try again." );
            continue;
        }

        else
            sentinel = true;
    }


    for ( counter = 0; counter <= num; ++counter ) {
        sum += ( pow( 2, counter ) - ( pow( -1, counter ))) / 3;
        temp = ( pow( 2, counter ) - ( pow( -1, counter ))) / 3;
    }

    printf( "\n%s%16d\n", "Your decimal number is: ", num );
    printf( "%s%18d\n", "Jacobsthal number is: ", temp );
    printf( "%s%9u\n", "Sum of Jacobsthal sequence is: ", sum );

    sum = 0;


    for ( counter = 0; sum < INT_MAX; ++counter ) {
        sum += ( pow( 2, counter ) - ( pow( -1, counter ))) / 3;
        if ( sum > INT_MAX )
            break;
        }

        decimalNumber = counter - 1;


        printf( "\n%s%12d\n\n", "Limit of int type values is ", INT_MAX );
        sum = 0;
        printf("%30s\n\n%c%19s%24s%25s\n\n","TABLE",'n',"Decimal number","Jacobsthal number","Sum of sequence");


    for ( counter = decimalNumber; counter >= decimalNumber - 2; --counter ) {
        temp = ( pow( 2, counter ) - ( pow( -1, counter ))) / 3 ;

        for ( counter2 = 0; counter2 <= counter; ++counter2 )
            sum += ( pow( 2, counter2 ) - ( pow( -1, counter2 ))) / 3;

        printf( "%d%7zu%28d%28u\n", progress++, counter, temp, sum );
        sum = 0;
    }

    puts( "" );

    return EXIT_SUCCESS;
}