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


int main( int argc, char **argv )
{
    int i = 0;
    int x;
    char ni[10], no[10];    //failinimede defineerimine
    int digits[3];
    char letter[3] = {'A', 'B', 'H'};
    int A, B, H;
    double X,Y;

    FILE *fi, *fo;          //faili viidad (file input, file output)

    printf( "Algandmete faili nimi on " );
    scanf( "%s", ni );

    printf( "Tulemuste faili nimi on " );
    scanf( "%s", no );

    fi = fopen( ni, "r" );      //fail avatakse lugemiseks
    fo = fopen( no, "w" );      //fail avatakse kirjutamiseks

    if ( NULL == fi )
    {
        printf( "%s fail polnud voimalik avada.\n", ni );

        return 1;
    }

    if ( NULL == fo )
    {
        printf( "%s fail polnud voimalik avada.\n", no );

        return 1;
    }

    while ( EOF != fscanf( fi, "%d", &x ) )     //loeb failist lopuni
    {
        if ( 3 > i )
        {
            fprintf( fo, "%c = %d\n", letter[ i ], x );
            digits[ i ] = x;
        }
        i++;
        //printf( "%2d. arv on %d\n", i, x );
        //fprintf( fo, "%c = %d\n", c, x );
        //printf( "%d ", x );
    }

    A = digits[0];
    B = digits[1];
    H = digits[2];

    printf( "Here is A = %d\n", A );
    fprintf( fo, "Here is A = %d\n", A );
    printf( "Here is B = %d\n", B );
    fprintf( fo, "Here is B = %d\n", B );
    printf( "Here is H = %d\n", H );
    fprintf( fo, "Here is H = %d\n", H );

    printf( "\n" );


    printf("  ARGUMENT  |  Funktsioon\n");
    printf("____________|_____________\n");


    /*if( A > B ) {
        do {
            printf("H (H < 0) = ");
            scanf("%lf", &H);
        } while ( H >= 0 );
    } else {
        do {
            printf("H (H > 0) = ");
            scanf("%lf", &H);
        } while ( H <= 0 );*/



    do {

        if( i == 0 ) {
            X = A;
        }

        if( X > B ) {
            if ( i == 1 ) {
               X = A + H;
            }
            if( i > 1 ) {
                X = A + i * H;
            }
            if(X<B) {
                     return 0;
                     }
        }

        if( X < B ) {
            if( i == 1 ) {
                X = A + H;
            }
            if( i > 1 ) {
                X = A + i * H;
            }
            if(X>B) {
                     return 0;
                     }
        }

        Y = log( sqrt( exp( (double)(X - 1) ) ) );

        if( exp( X - 1 ) < 0 ) {
            printf("Puudub\n");
        } else {
            printf("%10.4lf  |%10.4lf\n", X, Y);
            fprintf(fo,"%10.4lf  |%10.4lf\n", X, Y);
        }

        if( X == B ) {
            return 0;
        }

        i++;

    } while(1);



    fclose( fi );       //faili (file input) sulgemine
    fclose( fo );       //faili (file output) sulgemine

    return 0;
}