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

int main(void)
{
	double u0 = 1. ,u_exp;
	double u1 = 1. , u_n;
	double t = 0., dt =0.01;
	int i,n=100;

	FILE * A;
	A = fopen("sr.txt","w");

	for(i=0;i<n;i++)
	{
		u_exp = exp((-10.)*t);
		u_n = u1*(1.+dt*(-10.));
		fprintf(A,"%lf %lf %lf \n",t,u_exp,u_n);
		u1=u_n;
		t=t+dt;
	}
	return 0;
}