打印任意进制，进制转换函数

/*函数：r进制转换成10进制*/

int rToTen(string n,int r){

    //将r进制转为10进制，n是该r进制的字符串表示

    int len = n.length();

    int ans = 0;

    int i = 0;

    while(i<len){

        ans*=r;

        ans+=n[i]-'0';

        i++;

    }

    return ans;

}

 

/*函数：十进制转任意进制*/

void tenToR(int n,int r){

    //十进制n转r进制 ，返回字符串s

    char str[1005];

    memset(str,'',sizeof(str));

    stack<int>s;

    while(n){

        s.push(n%r);

        n = n/r;

    }

    int i = 0;

    while(!s.empty()){

        switch(s.top()){

            case 10:

                str[i++] = 'A';

                break;

            case 11:

                str[i++] = 'B';

                break;

            case 12:

                str[i++] = 'C';

                break;

            case 13:

                str[i++] = 'D';

                break;

            case 14:

                str[i++] = 'E';

                break;

            case 15:

                str[i++] = 'F';

                break;

            default:

                str[i++] = s.top()+'0';

        }

        s.pop();

    }

       cout<<str<<endl;

}