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  1. #include <stdio.h>
  2. #include <math.h>
  3. /*
  4.     Student:  Bill Davern
  5.     Date:     June 3, 2025
  6. */
  7.  
  8. /*  These are function prototypes */
  9. float Calculate_Simple_Interest (float principle, float rate, float time);
  10. float Calculate_Compound_Interest (float principle, float rate, float time);
  11.  
  12. /*****************************************************************
  13. ** Function:  Calculate_Simple_Interest
  14. **
  15. ** Description:  Simple Interest is the amount of interest
  16. **               calculated by using the formula:
  17. **
  18. **               interest = (P * R * T)
  19. **
  20. **               where P is the principle, r is the rate, and t
  21. **               is the time of the investment
  22. **
  23. **               This function will return the simple interest
  24. **               calculated based upon it being passed the principle,
  25. **               rate, and time.
  26. **
  27. ** Parameters:   Principle - The original principal to start with
  28. **               Rate      - The rate of interest.  If you wanted
  29. **                           9.5 percent it would be passed as 0.095
  30. **               Time      - The time in years
  31. **
  32. ** Returns:      Interest  - The amount of simple interest earned
  33. **
  34. ********************************************************************/
  35.  
  36. float Calculate_Simple_Interest (float principle, float rate, float time) 
  37. { 
  38.     /* You will only need to create three simple statements here ... */ 
  39.     /* No other statements are needed. */  
  40.  
  41.     /* 1) TO DO: Step 1) Define local variable of type float to */
  42.     /*                   hold the interest                      */ 
  43.     float interest;
  44.     /* 2) TO DO: Step 2) Calculate simple interest earned - Determine the */ 
  45.     /* interest using the values in the parameters: principle, rate, and  */ 
  46.     /* time ... and assign that value to the local variable you created   */
  47.     /* in Step 1 that holds the interest                                  */ 
  48.     /* .... Hint: This statement is right in the first homework           */ 
  49. 	interest = principle * rate * time;
  50.  
  51.     /* 3) TO DO: Step 3) Add a return statement to return the interest */
  52.     /*                   calculated to main                            */ 
  53.  	return interest;
  54. } /* end Calculate_Simple_Interest */ 
  55.  
  56. /*****************************************************************
  57. ** Function:  Calculate_Compound_Interest
  58. **
  59. ** Description:  Compound Interest is the amount of interest
  60. **               calculated by using the formula:
  61. **
  62. **               interest = (P * pow (1.0 + r, t)) - P
  63. **
  64. **               where P is the principle, r is the rate, and t
  65. **               is the time of the investment
  66. **
  67. **               This function will return the compound interest
  68. **               calculated based upon it being passed the principle,
  69. **               rate, and time.
  70. **
  71. ** Parameters:   Principle - The original principal to start with
  72. **               Rate      - The rate of interest.  If you wanted
  73. **                           9.5 percent it would be passed as 0.095
  74. **               Time      - The time in years
  75. **
  76. ** Returns:      Interest  - The amount of compound interest earned
  77. **
  78. ********************************************************************/
  79.  
  80. float Calculate_Compound_Interest (float principle, float rate, float time)
  81. {
  82.     /* 1) define a local variable of type float to hold the interest */
  83.     float interest;
  84.  
  85.     /* 2) TO DO:  calculate compound interest earned ...           */
  86.     /* Set interest variable to the right formula value, see above */
  87. 	interest = (principle * pow(1.0 + rate, time)) - principle;
  88.  
  89.     /* 3) return the interest calculated back to the calling function */
  90.     return (interest);
  91.  
  92. } /* end Calculate_Compound_Interest */
  93.  
  94. int main (void) 
  95. { 
  96.     float interest;  /* The simple interest earned over a period of time */
  97.     float compInterest; /* The compound interest earned over a period of time*/
  98.     float principle; /* The amount being invested */ 
  99.     float rate;      /* The interest rate earned */ 
  100.     float time;      /* The years of the investment */ 
  101.  
  102.     /* Initialize the interest value */ 
  103.     interest = 0;
  104.  
  105.     /* Enter values needed to determine interest */ 
  106.     printf ("Enter your principle value: "); 
  107.     scanf ("%f", &principle); 
  108.  
  109.     printf ("\nEnter the rate: For example 9.5 percent would be .095: "); 
  110.     scanf ("%f", &rate); 
  111.  
  112.     printf ("\nEnter the period of time of your investment: "); 
  113.     scanf ("%f", &time); 
  114.  
  115.     interest = Calculate_Simple_Interest (principle, rate, time); 
  116.  
  117.     /* print the simple interest earned to the screen */ 
  118.     printf("\n\nThe total simple interest earned is: $%8.2f\n", interest); 
  119.  
  120.     /* Call the Calculate_Compound_Interest function and print that     */
  121.     /* interest here if you decide to do the challenge ... it is called */
  122.     /* just like the Calculate_Simple_Interest function and printed     */
  123.     /* the same way.                                                    */
  124.     compInterest = Calculate_Compound_Interest (principle, rate, time); 
  125.  
  126.     /* print the simple interest earned to the screen */ 
  127.     printf("\n\The total Compound interest earned is: $%8.2f\n", compInterest); 
  128.  
  129.     printf("The difference between the 2 is compound - simple = $%8.2f", compInterest - interest);
  130.  
  131.     return (0); /* indicate successful completion */
  132.  
  133. } /* end main */
Success #stdin #stdout 0s 5324KB
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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

The total Compound interest earned is: $ 3257.06
The difference between the 2 is compound - simple = $  692.06
https://ideone.com/v0pXoU
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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