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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. /* set up function prototypes */
  5. float Calculate_Simple_Interest (float principle, float rate, float time);
  6. float Calculate_Compound_Interest (float principle, float rate, float time);
  7.  
  8. /*****************************************************************
  9. ** Function:  Calculate_Simple_Interest
  10. **
  11. ** Description:  Simple Interest is the amount of interest
  12. **               calculated by using the formula:
  13. **
  14. **               interest = (P * R * T)
  15. **
  16. **               where P is the principle, r is the rate, and t
  17. **               is the time of the investment
  18. **
  19. **               This function will return the simple interest
  20. **               calculated based upon it being passed the principle,
  21. **               rate, and time.
  22. **
  23. ** Parameters:   Principle - The original principal to start with
  24. **               Rate      - The rate of interest.  If you wanted
  25. **                           9.5 percent it would be passed as 0.095
  26. **               Time      - The time in years
  27. **
  28. ** Returns:      Interest  - The amount of simple interest earned
  29. **
  30. ********************************************************************/
  31.  
  32. float Calculate_Simple_Interest (float principle, float rate, float time) 
  33. { 
  34.     float interest;   /* simple interest */
  35.  
  36.     /* Calculate the simple interest */
  37.     interest = principle * rate * time;
  38.  
  39.     /* Return the calculated simple interest back to the calling function */
  40.     return (interest);
  41.  
  42. } /* end Calculate_Simple_Interest */ 
  43.  
  44. /*****************************************************************
  45. ** Function:  Calculate_Compound_Interest
  46. **
  47. ** Description:  Compound Interest is the amount of interest
  48. **               calculated by using the formula:
  49. **
  50. **               interest = (P * pow (1.0 + r, t)) - P
  51. **
  52. **               where P is the principle, r is the rate, and t
  53. **               is the time of the investment
  54. **
  55. **               This function will return the compound interest
  56. **               calculated based upon it being passed the principle,
  57. **               rate, and time.
  58. **
  59. ** Parameters:   Principle - The original principal to start with
  60. **               Rate      - The rate of interest.  If you wanted
  61. **                           9.5 percent it would be passed as 0.095
  62. **               Time      - The time in years
  63. **
  64. ** Returns:      Interest  - The amount of compound interest earned
  65. **
  66. ********************************************************************/
  67.  
  68. float Calculate_Compound_Interest (float principle, float rate, float time)
  69. {
  70.     float interest;  /* The compound interest */
  71.  
  72.     /* Calculate the compound interest */
  73.     interest = (principle * pow (1.0 + rate, time)) - principle;
  74.  
  75.     /* Return the calcuated interest back to the calling function */
  76.     return (interest);
  77.  
  78. } /* end Calculate_Compound_Interest */
  79.  
  80. int main (void) 
  81. { 
  82.     float interest; /* The interest earned over a period of time */
  83.     float compound_interest;
  84.     float principle; /* The amount being invested */ 
  85.     float rate;  /* The interest rate earned */ 
  86.     float time; /* The years of the investment */ 
  87.  
  88.     /* Initialize the interest value */ 
  89.     interest = 0;
  90.     compound_interest = 0;
  91.  
  92.     /* Enter values needed to determine interest */ 
  93.     printf ("\nEnter your principle value: "); 
  94.     scanf ("%f", &principle); 
  95.  
  96.     printf ("\nEnter the rate: For example 9.5 percent would be .095: "); 
  97.     scanf ("%f", &rate); 
  98.  
  99.     printf ("\nEnter the period of time of your investment: :"); 
  100.     scanf ("%f", &time); 
  101.  
  102.     /* Calculate the simple interest */
  103.     interest = Calculate_Simple_Interest (principle, rate, time); 
  104.  
  105.     /* print the simple interest earned to the screen */ 
  106.     printf("\n\nThe total simple interest earned is: $%8.2f\n", interest); 
  107.  
  108.     /* Calculate the compound interest */
  109.     compound_interest = Calculate_Compound_Interest (principle, rate, time);
  110.  
  111.     /* print the compound interest to the screen */
  112.     printf("\nThe total compound interest earned is: $%8.2f\n", compound_interest);
  113.  
  114.     return (0); /* indicate successful completion */
  115.  
  116. } /* end main */
Success #stdin #stdout 0s 5320KB
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10000
0.095
4
stdout
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Enter your principle value: 
Enter the rate: For example 9.5 percent would be .095: 
Enter the period of time of your investment: :

The total simple interest earned is: $ 3800.00

The total compound interest earned is: $ 4376.61
https://ideone.com/4Ntwqd
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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