fac()阶乘函数的写法

fac()阶乘函数的写法

1.

int main()
{long w, n,i,j=1;cout<<"请输入正整数n:"<<endl;cin>>n;for(i=1;i<=n;i++)j*=i;cout<<"正整数"<<n<<"的阶乘为:"<<j<<endl;return 0;
} 

int fac(int n)
{static int f=1;f=f*n;return f;
}

int fac(int n)
{register int i,f=1;for(i=1;i<=n;i++) f=f*i;return f;
}