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小算法 : 水仙花数

水仙花数是指一个 n 位数 ( n≥3 ),它的每个位上的数字的 n 次幂之和等于它本身。(例如:1^3 + 5^3 + 3^3 = 153)

初步代码:

int nMax = 9999999;

int nResult[9999];

int nCount = 0;

for( int i = 0; i < nMax; i++ )

{

    if( i < 10 )

    {

        if( i == i * i * i )

        {

            nResult[nCount] = i;

            nCount++;

        }  

    }

    else if( i < 100 )

    {

        int nG = i % 10;

        int nS = i / 10 % 10;

        if( i == nG * nG * nG + nS * nS * nS )

        {

            nResult[nCount] = i;

            nCount++;

        }

    }

    else if( i < 1000 )

    {

        int nG = i % 10;

        int nS = i / 10 % 10;

        int nB = i / 100 % 10;

        if( i == nG * nG * nG + nS * nS * nS + nB * nB * nB )

        {

            nResult[nCount] = i;

            nCount++;

        }

    }

    else if( i < 10000 )

    {

        int nG = i % 10;

        int nS = i / 10 % 10;

        int nB = i / 100 % 10;

        int nQ = i / 1000 % 10;

        if( i == nG * nG * nG * nG + nS * nS * nS * nS + nB * nB * nB * nB + nQ * nQ * nQ * nQ)

        {

            nResult[nCount] = i;

            nCount++;

        }

    }

    else if( i < 100000 )

    {

        int nG = i % 10;

        int nS = i / 10 % 10;

        int nB = i / 100 % 10;

        int nQ = i / 1000 % 10;

        int nW = i / 10000 % 10;

        if( i == nG * nG * nG * nG * nG + nS * nS * nS * nS * nS + nB * nB * nB * nB * nB + nQ * nQ * nQ * nQ * nQ

            + nW * nW * nW * nW * nW )

        {

            nResult[nCount] = i;

            nCount++;

        }

    }

    else if( i < 1000000 )

    {

        int nG = i % 10;

        int nS = i / 10 % 10;

        int nB = i / 100 % 10;

        int nQ = i / 1000 % 10;

        int nW = i / 10000 % 10;

        int nSW = i /100000 % 10;

        if( i ==    nG * nG * nG * nG * nG * nG +

                    nS * nS * nS * nS * nS * nS +

                    nB * nB * nB * nB * nB * nB +

                    nQ * nQ * nQ * nQ * nQ * nQ +

                    nW * nW * nW * nW * nW * nW +

                    nSW * nSW * nSW * nSW * nSW * nSW )

        {

            nResult[nCount] = i;

            nCount++;

        }

    }

    else if( i < 10000000 )

    {

        int nG = i % 10;

        int nS = i / 10 % 10;

        int nB = i / 100 % 10;

        int nQ = i / 1000 % 10;

        int nW = i / 10000 % 10;

        int nSW = i /100000 % 10;

        int nBW = i /1000000 % 10;

        if( i ==    nG * nG * nG * nG * nG * nG * nG +

                    nS * nS * nS * nS * nS * nS * nS +

                    nB * nB * nB * nB * nB * nB * nB +

                    nQ * nQ * nQ * nQ * nQ * nQ * nQ +

                    nW  * nW  * nW  * nW  * nW  * nW  * nW +

                    nSW * nSW * nSW * nSW * nSW * nSW * nSW+

                    nBW * nBW * nBW * nBW * nBW * nBW * nBW )

        {

            nResult[nCount] = i;

            nCount++;

        }

    }

}

CString str;

for( int j = 0; j < nCount; j++ )

{

    CString strTmp;

    strTmp.Format ( "%drn", nResult[j] );

    str += strTmp;

}

AfxMessageBox( str );}

  显然,上面的代码略显蠢笨,就像笨勤的郭靖,但却很认真。当然,如果要快速求出5位数以内的所有水仙花数,上面上家是最简单也是最快的。

  但是,如果要判断任意一个整数是否是水仙花数,就不是很适用了。参考如下代码,由百度得到(我进行了整理,调试和存在的问题的修改):

long n;
long p;
long c,a,j,s[30],i,q;
p=0;
a=10;
scanf("%d",&n);
q=n;

c = n; //JQB ADD//计算出位数
for(i=1;c>10 ;++i)
{
c=n/a;
a=a*10;
}

printf(

"i=%d,a=%d n",i,a);//得到每一位数,并依次放入数组中
for (j=1;a>=10 ;++j)
{
s[j]=n/(a/10);
n=n-s[j]*(a/10);
a=a/10;
printf("j=%d,a=%dn",j,a);
}//计算n位数的每一位的n次方的和
for (j=1;j<=i ;j++)
{
p+=pow(s[j],i);printf("p=%d,i=%dn",p,i);
}if (p==q)
{
printf("%d 为水仙花数",q);
}
else
{
printf("%d 该数不是水仙花数",q);
}

相关知识

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