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  1. #include <iostream>
  2. #include <cmath>
  3. #include <iomanip>
  4. using namespace std;
  5.  
  6. void my_pi_func(int term);
  7.  
  8. int main()
  9. {
  10.     int term;
  11.  
  12.     cout << fixed << setprecision(12); // set digits after decimal to 12         
  13.  
  14.     while (cin >> term){
  15.         my_pi_func(term);
  16.     }
  17.  
  18.     return 0;
  19.  
  20. }
  21.  
  22. void my_pi_func(int term)
  23. {
  24.     if (term <= 0){
  25.         cout << "\n\nNegative value or 0 read\n\n" << endl;
  26. 		return;
  27.     }
  28.  
  29.     double leibniz = 0.0; // pi value calculated from Leibniz                     
  30.     int counter = 0; // starting value                                       
  31.     double eulerall = 0.0; // value calculated from Euler (all integers)          
  32.     double eulerodd = 0.0; // value calculated from Euler (odds)                  
  33.     double eulerallans = 0.0; // pi value calculated from Euler series (all integers)   
  34.     double euleroddans = 0.0; // pi value calculated from Euler series (odd integers)
  35.  
  36.     while(term > counter){
  37.     leibniz = 4*(pow(-1, counter)) / (2*counter+1) + leibniz;
  38.     eulerall = (1/pow(counter+1,2)) + eulerall;
  39.     eulerodd = (pow(-1, counter)) / (pow(2*counter + 1, 3)) + eulerodd;
  40.     counter++;
  41.     eulerallans = sqrt(eulerall*6);
  42.     euleroddans =  pow(32*eulerodd, 1.0/3.0);
  43.     }
  44.     cout << right << setw(14) << "# TERMS" << setw(15) << "LEIBINZ" << setw(15)
  45.     << "EULER-ALL" << setw(15) << "EULER-ODD" << endl;
  46.     cout << right << setw(14) << term << " " << leibniz << " " << eulerallans 
  47.     << " " << euleroddans <<endl;
  48.  
  49.  
  50. }
Success #stdin #stdout 0s 3304KB
comments (?)
stdin
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1

6

-5

100

-1000000

0
stdout
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       # TERMS        LEIBINZ      EULER-ALL      EULER-ODD
             1 4.000000000000 2.449489742783 3.174802103936
       # TERMS        LEIBINZ      EULER-ALL      EULER-ODD
             6 2.976046176046 2.991376494748 3.141291949057


Negative value or 0 read


       # TERMS        LEIBINZ      EULER-ALL      EULER-ODD
           100 3.131592903559 3.132076531809 3.141592586052


Negative value or 0 read




Negative value or 0 read
https://ideone.com/x51u8n
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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