用Java编写计算1的阶乘一直加到20的阶乘是多少，我编的错在哪啊，

//计算 1!+2!+…+20!。程序名：X03_06For.java
public class X03_06For{
public static void main(String args[]){
int sum=0,n,m,a=1;
for(n=1;n<=20;n++)
for(m=1;m<=n;m++)
a*=m;
sum+=a;
System.out.println("1!+2!+…+20!="+sum);
}
}

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for(n=1;n<=20;n++)
{
int a= 1 ; // 这里添加消咐键出简搜来拿巧
for(m=1;m<=n;m++)
{
a*=m;
}
sum+=a;
}

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public class A{

public Integer getTotal(Integer n){
int sum = 0;
for(int i=1;i<=n;i++){
sum+=this.getValue(i);
}
return sum;
}
private Integer getValue(Integer n){
int j = 1;
for(int i = 1;i<=n;i++){
j = j*i;
}
n = j;
return n;
}

public static void main(String args[]){
A a=new A();
int b = a.getTotal(20);
System.out.println(b)
}
}

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/唯樱李/计算 1!+2!+…+20!。程序名颂旁：X03_06For.java
public class X03_06For {
public static void main(String args[]) {
int sum = 0, n, a = 1;
for (n = 1; n <= 5; n++) {
a = a * n;
sum += a;
}
System.out.println("指迟1!+2!+…+20!=" + sum);
}
}

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# include<stdio.h> int main() { double a,i=1,b=1,sum=0; for(不知道是c语言的代码，还枣仿是裤岩敬c++的代码。混淆了！ # include<stdio.h>胡慎 ,ixqvpY

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建议楼主用java软件加个断点编译程序，慢慢研究、、、

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