1 #include <iostream> 2 #include <math.h> 3 using namespace std; 4  5 int StringToInt(string n) 6 { 7     int result = 0; 8     int count = 1; 9     int tmp = 0;10 11     //cout << "StringToInt" << endl;12 13     for(char ch : n)14     {15         //cout << ch << endl;16         //cout << (ch-48) << endl;17         tmp = pow(10,n.length()-count);18         count++;19 20         //cout << "tmp: " << tmp;21         //cout << " " << pow(10,tmp) << endl;22         result += (ch-48)*tmp;23         //cout << result << endl;24     }25     //cout << result << endl;26     return result;27 }28 29 void Callatz()30 {31     int input;32     string n;33     int count = 0;34     35     //cout<< "please enter the value of n: ";36     cin>>n;37     //cout<< "n = " <<  n << endl;38     39     input = StringToInt(n);40     //cout<< "input = " <<  input << endl;41 42     while( input != 1 )43     {44         if (input % 2 == 0)45             input = input/2;46         else47             input = (3*input+1)/2;48         count++;49     }50 51     cout << count;52 }53 54 55 int main()56 {57     Callatz();58     return 0;59 }

 1 #n = int(raw_input()) 2 n=eval(input("please enter the value of n")) 3 #print(n) 4 count = 0 5 while (n != 1): 6     if (n%2 == 0): 7         n = n/2 8     else: 9         n = (3*n+1)/210     #print(n)11     count += 112 print(count)