fork download
copy 
  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.     /* You will only need to create three simple statements here ... */ 
  35.     /* No other statements are needed. */  
  36.  
  37.     /* 1) TO DO: Step 1) Define local variable of type float to */
  38.     /*                   hold the interest                      */ 
  39.     float interest;
  40.  
  41.     /* 2) TO DO: Step 2) Calculate simple interest earned - Determine the */ 
  42.     /* interest using the values in the parameters: principle, rate, and  */ 
  43.     /* time ... and assign that value to the local variable you created   */
  44.     /* in Step 1 that holds the interest                                  */ 
  45.     /* .... Hint: This statement is right in the first homework           */ 
  46.     interest = principle * rate * time;
  47.  
  48.     /* 3) TO DO: Step 3) Add a return statement to return the interest */
  49.     /*                   calculated to main                            */ 
  50.     return (interest);
  51.  
  52. } /* end Calculate_Simple_Interest */ 
  53.  
  54. /*****************************************************************
  55. ** Function:  Calculate_Compound_Interest
  56. **
  57. ** Description:  Compound Interest is the amount of interest
  58. **               calculated by using the formula:
  59. **
  60. **               interest = (P * pow (1.0 + r, t)) - P
  61. **
  62. **               where P is the principle, r is the rate, and t
  63. **               is the time of the investment
  64. **
  65. **               This function will return the compound interest
  66. **               calculated based upon it being passed the principle,
  67. **               rate, and time.
  68. **
  69. ** Parameters:   Principle - The original principal to start with
  70. **               Rate      - The rate of interest.  If you wanted
  71. **                           9.5 percent it would be passed as 0.095
  72. **               Time      - The time in years
  73. **
  74. ** Returns:      Interest  - The amount of compound interest earned
  75. **
  76. ********************************************************************/
  77.  
  78. float Calculate_Compound_Interest (float principle, float rate, float time)
  79. {
  80.     /* 1) define a local variable of type float to hold the interest */
  81.     float interest;
  82.  
  83.     /* 2) TO DO:  calculate compound interest earned ...           */
  84.     /* Set interest variable to the right formula value, see above */
  85.     interest = (principle * powf(1.0f + rate, time)) - principle;
  86.  
  87.     /* 3) return the interest calculated back to the calling function */
  88.     return (interest);
  89.  
  90. } /* end Calculate_Compound_Interest */
  91.  
  92. int main (void) 
  93. { 
  94.     float interest;  /* The interest earned over a period of time */
  95.     float principle; /* The amount being invested */ 
  96.     float rate;      /* The interest rate earned */ 
  97.     float time;      /* The years of the investment */ 
  98.  
  99.     /* Initialize the interest value */ 
  100.     interest = 0;
  101.  
  102.     /* Enter values needed to determine interest */ 
  103.     printf ("\nEnter your principle value: "); 
  104.     scanf ("%f", &principle); 
  105.  
  106.     printf ("\nEnter the rate: For example 9.5 percent would be .095: "); 
  107.     scanf ("%f", &rate); 
  108.  
  109.     printf ("\nEnter the period of time of your investment: :"); 
  110.     scanf ("%f", &time); 
  111.  
  112.     interest = Calculate_Simple_Interest (principle, rate, time); 
  113.  
  114.     /* print the simple interest earned to the screen */ 
  115.     printf("\n\nThe total simple interest earned is: $%8.2f\n", interest); 
  116.  
  117.     /* Call the Calculate_Compound_Interest function and print that     */
  118.     /* interest here if you decide to do the challenge ... it is called */
  119.     /* just like the Calculate_Simple_Interest function and printed     */
  120.     /* the same way.                                                    */
  121.     interest = Calculate_Compound_Interest (principle, rate, time);
  122.     printf("\n\nThe total compound interest earned is: $%8.2f\n", interest);
  123.  
  124.     return (0); /* indicate successful completion */
  125.  
  126. } /* end main */
  127.  
Success #stdin #stdout 0s 5284KB
comments (?)
stdin
copy 
4500 
0.095 
6
stdout
copy 
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
https://ideone.com/PpyoaY
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!