#include "stdafx.h"
#include<cmath>
#include<iostream>
using namespace std;
double e=2.7182818284590452353602874713526624977572;
double x;
//double a=pow(e,-x);
//double b=x/5;
double c=0.1;
double a;
double b;
void main()
{
for(x=1;x<100;x=x+c)
a=pow(e,-x);
b=x/5;
//cout<<a<<b;
if(a+b-1==0)
{cout<<"x的值为"<<x<<endl;}
}