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

int main(void)

{
	float e = 2.71828;
	int compt,j,k;
	float B,H,val,A;
	printf(" Insert vaLue of A \n");
	scanf("%lf", &A);
	printf(" Insert vaLue of B \n");
	scanf("%f", &B);
	printf(" Insert vaLue of H \n");
	scanf("%f", &H);

	if (( B < A ) || ( H < 0 ))
	  {
		  printf(" Incorrect insert. Try again =( ");
	  }

	compt = 0;
	float Mat[15][2];

	 while (compt<15 && A<B)
	 {
		 Mat[compt][0]=A;
	     val=log(sqrt(pow(e,A-1)));


		 Mat[compt][1]=val;
		 A=A+H;
		 compt=compt+1;

	 }

	 for (j=0; j<compt; j++)
	 {
		 for (k=0; j<2; k++)
		 {
			 printf("%f    ",Mat[j][k]);
		 }
		 printf("\n");
	 }
return 0;
}