static void Main(string[] args) { int sum = 0; for (int i = 1; i <= 15; i++) { int temp=0; for (int j = 1; j <= i; j++) { temp= i * j; } sum += temp; } Console.WriteLine(sum); Console.ReadKey(); }
using System; using System.Collections.Generic; using System.Linq; using System.Text;namespace CSharp { class Program { static void Main(string[] args) { int sum = 0; for (int i = 1; i <= 15; i++) { int t = 1; for (int j = 1; j <= i; j++) { t = t * j; } sum += t; } Console.WriteLine(sum); } } }
static void Main(string[] args) { long sum = 0; long tempResult; for (int i = 1; i <= 15; i++) { tempResult = 1; for (int j = 1; j <= i; j++) { tempResult *= j; } sum += tempResult; } Console.WriteLine("1--15的阶乘和是:"+sum); }
public int factorial(int m) // 阶乘 { int sum = 0; // 和 for (int i; i < m; i++) { int product = 0; //乘积 for (int j = 1; j <= i; j++) { product *= j; } sum += product; } return sum; }
class Program { static void Main(string[] args) { int sum = 0; for (int i = 0; i < 16; i++) { sum = Fact(i) + sum; Console.WriteLine(sum); } Console.ReadLine(); } public static int Fact(int i) { if (i < 0) { throw new ArgumentOutOfRangeException("n必须为非负数。"); } if (i == 0) { return 1; } return i * Fact(i - 1); } }
using System; using System.Collections.Generic; using System.Linq; using System.Text;namespace jiecheng { class Program { static void Main(string[] args) { long sum = 0; for (int i = 1; i <= 15; i++) { long temp = 1; for (int j = 1; j <= i; j++) { temp *= j; } sum += temp; } Console.WriteLine(sum); Console.ReadKey(); } } }因为int型的范围是-2147483648~2147483647 1!加到15!范围超过了这个范围,所以计算的时候不能用int,可以使用long,如果在大的话,可以使用double等类型
using System; using System.Collections.Generic; using System.Linq; using System.Text;namespace ConsoleApplication8 { class Program { static void Main(string[] args) { int a =0; int j = 1; int sum = 0; Console.WriteLine("0的阶乘{0}",j); Console.WriteLine("阶乘公式:n!=n×(n-1)!"); for (int i = 1; i < 16; i++) { a= i * j; j = a; sum += a; Console.WriteLine(i.ToString() + "的阶乘为"+a.ToString()); } Console.WriteLine("总和为:"+sum.ToString()); Console.ReadKey(); } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text;namespace ConsoleApplication8 { class Program { static void Main(string[] args) { Int64 a =0; Int64 j = 1; Int64 sum = 0; Console.WriteLine("0的阶乘{0}",j); Console.WriteLine("阶乘公式:n!=n×(n-1)!"); for (Int64 i = 1; i < 16; i++) { a= i * j; j = a; sum += a; Console.WriteLine(i.ToString() + "的阶乘为"+a.ToString()); } Console.WriteLine("总和为:"+sum.ToString()); Console.ReadKey(); } } } //更正一下前面的都不对,这个才对,要用到Int64位的才可以正确显视
using System; using System.Collections.Generic; using System.Text;namespace ConsoleApplication1 { class Program { static void Main(string[] args) { int i = 0; int j = 0; int times = 1;//阶乘 int counter = 0;//累加 for (i = 1; i <= 15; i++) { for (j = 1; j <= i; j++) { times *= j; } counter += times; times = 1; } Console.WriteLine("1!+2!+...+15!=" + counter.ToString("d"));//1443297817 } } }
{
int sum = 0;
for (int i = 1; i <= 15; i++)
{
int temp=0;
for (int j = 1; j <= i; j++)
{
temp= i * j;
}
sum += temp;
}
Console.WriteLine(sum);
Console.ReadKey();
}
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace CSharp
{
class Program
{
static void Main(string[] args)
{
int sum = 0;
for (int i = 1; i <= 15; i++)
{
int t = 1;
for (int j = 1; j <= i; j++)
{
t = t * j;
}
sum += t;
}
Console.WriteLine(sum);
}
}
}
{
long sum = 0;
long tempResult;
for (int i = 1; i <= 15; i++)
{
tempResult = 1;
for (int j = 1; j <= i; j++)
{
tempResult *= j;
}
sum += tempResult;
}
Console.WriteLine("1--15的阶乘和是:"+sum);
}
public int factorial(int m) // 阶乘
{
int sum = 0; // 和
for (int i; i < m; i++)
{
int product = 0; //乘积
for (int j = 1; j <= i; j++)
{
product *= j;
} sum += product;
}
return sum;
}
class Program
{
static void Main(string[] args)
{
int sum = 0;
for (int i = 0; i < 16; i++)
{
sum = Fact(i) + sum;
Console.WriteLine(sum);
}
Console.ReadLine();
}
public static int Fact(int i)
{
if (i < 0)
{
throw new ArgumentOutOfRangeException("n必须为非负数。");
}
if (i == 0)
{
return 1;
}
return i * Fact(i - 1);
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace jiecheng
{
class Program
{
static void Main(string[] args)
{
long sum = 0;
for (int i = 1; i <= 15; i++)
{
long temp = 1;
for (int j = 1; j <= i; j++)
{
temp *= j;
}
sum += temp;
}
Console.WriteLine(sum);
Console.ReadKey();
}
}
}因为int型的范围是-2147483648~2147483647
1!加到15!范围超过了这个范围,所以计算的时候不能用int,可以使用long,如果在大的话,可以使用double等类型
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace ConsoleApplication8
{
class Program
{
static void Main(string[] args)
{
int a =0;
int j = 1;
int sum = 0;
Console.WriteLine("0的阶乘{0}",j);
Console.WriteLine("阶乘公式:n!=n×(n-1)!");
for (int i = 1; i < 16; i++)
{
a= i * j;
j = a;
sum += a;
Console.WriteLine(i.ToString() + "的阶乘为"+a.ToString());
}
Console.WriteLine("总和为:"+sum.ToString());
Console.ReadKey(); }
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace ConsoleApplication8
{
class Program
{
static void Main(string[] args)
{
Int64 a =0;
Int64 j = 1;
Int64 sum = 0;
Console.WriteLine("0的阶乘{0}",j);
Console.WriteLine("阶乘公式:n!=n×(n-1)!");
for (Int64 i = 1; i < 16; i++)
{
a= i * j;
j = a;
sum += a;
Console.WriteLine(i.ToString() + "的阶乘为"+a.ToString());
}
Console.WriteLine("总和为:"+sum.ToString());
Console.ReadKey(); }
}
}
//更正一下前面的都不对,这个才对,要用到Int64位的才可以正确显视
using System.Collections.Generic;
using System.Text;namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int i = 0;
int j = 0;
int times = 1;//阶乘
int counter = 0;//累加
for (i = 1; i <= 15; i++)
{
for (j = 1; j <= i; j++)
{
times *= j;
}
counter += times;
times = 1;
}
Console.WriteLine("1!+2!+...+15!=" + counter.ToString("d"));//1443297817
}
}
}
后面加个 Console.ReadKey(); 避免直接显示完结果就退出