Program output c sharp

harish reddy

Write a program in C# Sharp to find the sum of the series [ x - x^3 + x^5 + ......] using for loop. I did till here...but not getting the ouput.

int x = int.Parse(Console.ReadLine());

int n = int.Parse(Console.ReadLine());

double sum = 0;

for (int i = 1; i <= n; i=i+2)

{

double result = Math.Pow(x, i);

sum = sum + result;

}

Console.WriteLine(sum);

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Laxmidhar Sahoo8y ago
sir you are write .but left sign I do in bellow
int x = int.Parse(Console.ReadLine());
int n = int.Parse(Console.ReadLine());
double sum = 0;
int sn = 1;
for (int i = 1; i <= n; i=i+2)
{
double result = Math.Pow(x, i)*sn;
sum = sum + result;
sn = sn*-1;
}
Console.WriteLine(sum);
0
Rajeesh Menoth8y ago
Hi harish,

You can check my code and reference. The same question already done by some people.
0
harish reddy8y ago
In my code:

int x = int.Parse(Console.ReadLine());
int n = int.Parse(Console.ReadLine());
double sum = 0;
for (int i = 1; i <= n; i=i+2)
{
double result = Math.Pow(x, i);
sum = sum + result;
}

Console.WriteLine(sum);

the output i require is x-x^3+x^5-x^7+.....

but the code i have written is for x+x^3+x^5+x^7+.....

how can i get the output i want..
0
Rajeesh Menoth8y ago
Hi,

Code :
using System;

public class Exercise24
{
    public static void Main()
    {
        double x, sum, no_row, ctr;
        int i, n;
        Console.Write("\n\n");
        Console.Write("Calculate the sum of the series [ x - x^3 + x^5 + ......]:\n");
        Console.Write("------------------------------------------------------------");
        Console.Write("\n\n");
        Console.Write("Input the value of x :");
        x = Convert.ToInt32(Console.ReadLine());
        Console.Write("Input number of terms : ");
        n = Convert.ToInt32(Console.ReadLine());
        sum = x;
        no_row = x;
        for (i = 1; i < n; i++)
        {
            ctr = (2 * i) * (2 * i + 1);
            no_row = -no_row * x * x / ctr;
            sum = sum + no_row;
        }

        Console.Write("\nThe sum = {0}\nNumber of terms = {1}\n The value of x = {2}\n", sum, n, x);
    }
}
Please check the reference :

https://www.w3resource.com/csharp-exercises/for-loop/csharp-for-loop-exercise-24.php

Demo :

https://dotnetfiddle.net/esIzPc
+1
Ramesh Palanivel8y ago
Hi harish,

its working fine. The output seems correct. What is your expecting output?
0