10！用C语言怎么写？

                                10！用C语言怎么写？

 #include<stdio.h>
main()
{ 
long i,n=10,a;
scanf("%ld",&a);
for(i=1;i<=a;i++) n=n*i;
printf("%ld\n",n);
}
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#include
main ()
{long sum;
int i,n=1;
for(i=1;i＜=10;i++)
{
n=n*i;
}
sum=n;
printf("%ld\n",sum);
}

 #include<stdio.h>
int fun(int n);
int main(void)
{
    int n=10;

    printf("%d\n",fun(n));
    return 0;
}
int fun(int n)
{
    if(n==0||n==1)
        return 1;
    else
        return n*fun(n-1);
}

#include
int mail()
{
int n=1;
int i=1;
for(n<=10)
{
i=i*n;
n++;
}
printf("%d\n",i);
}