问题
Calculate the algebraic expression Z, for which n is inputted by user. Use 2 for loops to solve the problem.
My code so far:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int n, k = 1;
double z;
float sum, p;
n = Console.Read();
for (int i = 0; i < n; i+=2)
{
sum += p;
for (int j = 0; j < n; j++)
{
p *= (3 * k + 2);
}
}
}
}
}
I'm totally stack in the for loops... any help is appreciated.
回答1:
- p has to be initialized to 1 as 0 * X == 0
- Also i and j (why not k) have to be initialized to 1 as it is required by your formula
- You have to sum up the products after the products where calculated as you would add 1 to the correct result otherwise and you would not add the last calculated product
So the code below should give the correct result:
float sum = 0;
int n = Console.Read();
for (int i = 1; i <= n; i++)
{
float p = 1;
for (int k = 1; k <= i+2; k++)
{
p *= (3 * k + 2);
}
sum += p;
}
来源：https://stackoverflow.com/questions/19662357/calculate-the-algebraic-expression-in-c-sharp