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


 void vvod_dannih(char argc, char **argv)
 {
    char ni[10], no[10];

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

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

      }

 int main( int argc, char **argv )
{

  char ni[10], no[10];
  double A, B, H, X, Y;
  int i = 0;
  int x;
  int digits[2];
  char letter[3] = {'A', 'B'};

    FILE *fi, *fo;
     /*
    printf( "Algandmete faili nimi on " );
    scanf( "%s", ni );

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


    vvod_dannih(ni, no);

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

    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 ( 2 > i )
        {
            fprintf( fo, "%c = %d\n", letter[ i ], x );
            digits[ i ] = x;
        }
        i++;

    }

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

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

    //fprintf(fo, "H = %d\n", H);

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

    i=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");
            fprintf(fo, "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);
    return 0;
}