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  1. //Xinnuo Wang                   CS1A                   chapter 3 , P.146, #16
  2. //
  3. /*******************************************************************************
  4. *
  5. * Caculate earned interest
  6. *-------------------------------------------------------------------------------
  7. * This program asks for the principal, the interest rate, and the number of 
  8. * timesthe interest is compounded. And caculate the amount of earned interest. 
  9. *
  10. * computation is based on the formula:
  11. * Amount = Principal x (1 +Rate/T)^T
  12. * Interest  = Amount - Principal
  13. *-------------------------------------------------------------------------------
  14. * INPUT
  15. *    principal      : Balance in the savings account
  16. *    rate           : The interest rate in percent
  17. *    times          : The number of times the interest is compounded during a year
  18. * OUTPUT
  19. *    interst        : The amount of earned interst 
  20. *    amount         : The amount in savings
  21. *
  22. *******************************************************************************/
  23. #include <iostream>
  24. #include <cmath>
  25. #include <iomanip>
  26. using namespace std;
  27.  
  28. int main() 
  29. {
  30. 	double principal;  //INPUT - Balance in the savings account
  31. 	double rate;       //INPUT - The interest rate in percent
  32. 	int times;         //INPUT - The number of times the interest is compounded during a year
  33. 	double interest;   //OUTPUT - The amount of earned interst 
  34. 	double amount;     //OUTPUT - The amount in savings
  35. //
  36. //Input data
  37.     cout << "Enter balance in the savings account" << endl;
  38.     cin >> principal;
  39.     cout << "Enter the interest rate" << endl;
  40.     cin >> rate;
  41. 	cout << "Enter the number of times the interest is compounded during a year" << endl;
  42.     cin >> times;
  43. //
  44. //Compute the amount
  45.     amount = principal * pow(1+rate/100/times,times);
  46. //
  47. //Compute the earned interest
  48.     interest = amount - principal;
  49. //
  50. //Output Result
  51.     cout <<"Interest Rate:            "<<fixed<<setprecision(2)<<setw(10)<<rate<<"%"<<endl;
  52. 	cout <<"Times Compounded:         "<<setw(6)<<times<<endl;
  53. 	cout <<"Principal:               $"<<fixed<<setprecision(2)<<setw(10)<<principal<<endl;
  54. 	cout <<"Interest:                $"<<fixed<<setprecision(2)<<setw(10)<<interest<<endl;
  55. 	cout <<"Amount in Savings:       $"<<fixed<<setprecision(2)<<setw(10)<<amount<<endl;
  56. 	return 0;
  57. }
Success #stdin #stdout 0s 5316KB
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1234.8 4.4 4
stdout
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Enter balance in the savings account
Enter the interest rate
Enter the number of times the interest is compounded during a year
Interest Rate:                  4.40%
Times Compounded:              4
Principal:               $   1234.80
Interest:                $     55.23
Amount in Savings:       $   1290.03
https://ideone.com/wOhTQn
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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