大数阶乘

50

30414093201713378043612608166064768844377641568960512000000000000

#include<iostream>

<span style="font-size:18px;">using namespace std;
int a[10000000];
int main()
{
	int n,i,j,sum,t,b;
	cin>>n;
	a[0]=1;
	t=1;//数组长度
	for(i=2;i<=n;i++)
	{
		b=0;
		for(j=0;j<t;j++)
		{
			sum=a[j]*i+b;
			a[j]=sum%10;
			b=sum/10;
		}
		while(b!=0)
		{
			a[j++]=b%10;
			b=b/10;
			t++;
		}
	}
	for(i=t-1;i>=0;i--)
		cout<<a[i];
	cout<<endl;
	return 0;
}
</span>