hdu1042！【水题】

N!

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 54156    Accepted Submission(s): 15356

Problem Description

Given an integer N(0 ≤ N ≤ 10000), your task is to calculate N!

 

Input

One N in one line, process to the end of file.

 

Output

For each N, output N! in one line.

 

Sample Input

   
   
   
   

    
    
    
    1
2
3
   
   
   
   

 

Sample Output

   
   
   
   

    
    
    
    1
2
6
   
   
   
   

 

Author

JGShining（极光炫影）

 

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#include<stdio.h>
#include<string.h>
int a[1000000];
int main()
{
    int n, la, i, j, k;
    while(scanf("%d", &n) != EOF)
    {
        if(n == 0)
        {
            printf("1\n");
            continue;
        }
        memset(a, 0, sizeof(a));
        a[0] = 1;
        for(i = 1; i <= n; i++)
        {
            k = 0;
            for(j = 0; j < 40000; j++)
            {
                k = a[j] * i + k;
                a[j] = k % 10;
                k /= 10;
            }
        }
        for(i = 40000; i >= 0; i--)
        {
            if(a[i] != 0)
            {
                for(j = i; j>=0; j--)
                printf("%d", a[j]);
                printf("\n");
                break;
            }
        }
    }
    return 0;
}