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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. /* These are 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.    // Step 1: Define a local variable to hold interest
  35.     float interest;
  36.  
  37.     // Step 2: Calculate simple interest
  38.     interest = principle * rate * time;
  39.  
  40.     // Step 3: Return the interest
  41.     return interest;
  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.     /* Challenge Step 1) define a local float variable for interest */
  71.     float interest;
  72.  
  73.     /* Challenge TO DO: Step 2)  Calculate compound interest earned */
  74.     /* by setting interest variable using formula above */
  75.     interest = (principle * pow(1.0 + rate, time)) - principle;
  76.  
  77.     /* Challenge Step 3) return interest to the calling function */
  78.     return interest;
  79. } /* end Calculate_Compound_Interest */
  80.  
  81. int main (void) 
  82. { 
  83.     float interest;  /* The interest earned over a period of time */
  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.  
  91.     /* Enter values needed to determine interest */ 
  92.     printf ("\nEnter your principle value: "); 
  93.     scanf ("%f", &principle); 
  94.  
  95.     printf ("\nEnter the rate: For example 9.5 percent would be .095: "); 
  96.     scanf ("%f", &rate); 
  97.  
  98.     printf ("\nEnter the period of time of your investment: :"); 
  99.     scanf ("%f", &time); 
  100.  
  101.     interest = Calculate_Simple_Interest (principle, rate, time); 
  102.  
  103.     /* print the simple interest earned to the screen */ 
  104.     printf("\n\nThe total simple interest earned is: $%8.2f\n", interest); 
  105.  
  106.     /* Call the Calculate_Compound_Interest function and print that     */
  107.     /* interest here if you decide to do the challenge ... it is called */
  108.     /* just like the Calculate_Simple_Interest function and printed     */
  109.     /* the same way.                                                    */
  110.  
  111.     return (0); /* indicate successful completion */
  112.  
  113. } /* end main */
Success #stdin #stdout 0s 5324KB
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4500 
0.095 
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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: $ 2565.00
https://ideone.com/DfbBu1
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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