Question of C++

Question

Can you help with editing this code?

Write a program that calculates the value of
e ^ x using the following equation (up to three decimal places). This program will get x and the number of secret sentences n from the input.

e^x= 1 + x/1! + x^2/2! +x^3/3! +.....
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#include <iostream>
#include <math.h>
#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n = 1;
    double x;
    cout << "Enter x: " ;
    cin >> x;
    cout << "Enter n: " ;
    cin >> n;

    int fact = 1;
    for(int i = n-1; i <=n; ++i)
    {
        fact*=i;
    }
    int e;
    int sum1 = 0;
    int sum2;
    while(n>0)
    {
        e = pow(x,n-1)/fact;
        sum2 = sum1 + exp(x);
        n++;    
    }    

    cout << fixed << setprecision(3) <<sum2;
    return 0;
}

Answer 1

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
int n;
double x;
cout << "Enter x: "; cin >> x;
cout << "Enter n: "; cin >> n;

double sum = 1;
double fact = 1;
double px = 1;

for(int i = 1; i < n; ++i){
px *= x;
fact *= i;
sum += px / fact;
}

cout << fixed << setprecision(3) <<sum;
return 0;
}

Answer 2

zahrad
edited (should be < instead of <=, left after copy&paste of your code), check now

Answer 3

andriy kan

Thank you for your help. fixed

Answer 4

andriy kan

There's a problem. When I have
n = 1, the output must be 1 but not so.

Answer 5

Condtion in for loop should be <= instead of < .