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  1. #include <stdio.h>
  2. #include <math.h>    /* for the pow function */
  3.  
  4. /*****************************************************************
  5. ** Function:  Calculate_Simple_Interest
  6. **
  7. ** Description:  Simple Interest is the amount of interest
  8. **               calculated by using the formula:
  9. **
  10. **               interest = (P * R * T)
  11. **
  12. **               where P is the principle, r is the rate, and t
  13. **               is the time of the investment
  14. **
  15. **               This function will return the simple interest
  16. **               calculated based upon it being passed the principle,
  17. **               rate, and time.
  18. **
  19. ** Parameters:   Principle - The original principal to start with
  20. **               Rate      - The rate of interest.  If you wanted
  21. **                           9.5 percent it would be passed as 0.095
  22. **               Time      - The time in years
  23. **
  24. ** Returns:      Interest  - The amount of simple interest earned
  25. **
  26. ********************************************************************/
  27.  
  28. float Calculate_Simple_Interest (float principle, float rate, float time) 
  29. { 
  30.  
  31.     /* You will only need to create three simple statements here ... */ 
  32.     /* No other statements are needed.                               */          
  33.  
  34.     /* TO DO: Step 1) Define local variable of type float to hold interest  */
  35.     float interest;
  36.  
  37.  
  38.     /* TO DO: Step 2) Calculate simple interest earned.  Determine interest */ 
  39.     /* using the values in the parameters: principle, rate, and time ....   */
  40.     /* and assign that value to the local variable you created in step 1    */
  41.     /* that holds the interest                                              */ 
  42.     /* .... Hint: This statement is right in the first homework             */ 
  43.     interest = principle * rate * time;
  44.  
  45.     /* TO DO: Step 3) Add a return statement to return the interest to main */ 
  46.     return interest;
  47.  
  48. } /* end Calculate_Simple_Interest */ 
  49.  
  50.  
  51. /*****************************************************************
  52. ** Function:  Calculate_Compound_Interest
  53. **
  54. ** Description:  Compound Interest is the amount of interest
  55. **               calculated by using the formula:
  56. **
  57. **               interest = (P * pow (1.0 + r, t)) - P
  58. **
  59. **               where P is the principle, r is the rate, and t
  60. **               is the time of the investment
  61. **
  62. **               This function will return the compound interest
  63. **               calculated based upon it being passed the principle,
  64. **               rate, and time.
  65. **
  66. ** Parameters:   Principle - The original principal to start with
  67. **               Rate      - The rate of interest.  If you wanted
  68. **                           9.5 percent it would be passed as 0.095
  69. **               Time      - The time in years
  70. **
  71. ** Returns:      Interest  - The amount of compound interest earned
  72. **
  73. ********************************************************************/
  74.  
  75. float Calculate_Compound_Interest (float principle, float rate, float time)
  76. {
  77.     /* Challenge Step 1) define a local float variable for interest */
  78.     float interest;
  79.  
  80.     /* Challenge TO DO: Step 2)  Calculate compound interest earned */
  81.     /* by setting interest variable using formula above */
  82. 	interest = (principle * pow(1.0 + rate, time)) - principle;
  83.     /* Challenge Step 3) return interest to the calling function */
  84.     return (interest);
  85.  
  86. } /* end Calculate_Compound_Interest */
  87.  
  88. int main (void) 
  89. { 
  90.     float interest;  /* The interest earned over a period of time */
  91.     float principle; /* The amount being invested */ 
  92.     float rate;      /* The interest rate earned */ 
  93.     float time;      /* The years of the investment */       
  94.  
  95.     /* Initialize the interest value */ 
  96.     interest = 0;
  97.  
  98.     /* Enter values needed to determine interest */ 
  99.     printf ("\nEnter your principle value: "); 
  100.     scanf ("%f", &principle);  
  101.  
  102.     printf ("\nEnter the rate: For example 9.5 percent would be .095: "); 
  103.     scanf ("%f", &rate);  
  104.  
  105.     printf ("\nEnter the period of time of your investment: :"); 
  106.     scanf ("%f", &time); 
  107.  
  108.     /* Call simple interest function to calculate the simple interest */
  109.     interest = Calculate_Simple_Interest (principle, rate, time); 
  110.  
  111.     /* Print the simple interest earned to the screen */ 
  112.     printf ("\n\nThe total simple interest earned is: $%8.2f\n", interest); 
  113.  
  114.     /* Challenge TO DO: Step 1)  Call Calculate_Compound_Interest function */
  115.     /*                           to calculate the compound interest.       */
  116.     interest = Calculate_Compound_Interest (principle, rate, time);
  117.  
  118.     /* Challenge TO DO: Step 2)  Print the compound interest to the screen */ 
  119. 	printf ("\n\nThe total compound interest earned is: $%8.2f\n", interest);
  120.  
  121.     return (0); /* indicate successful completion */
  122.  
  123. } /* end main */
  124.  
Success #stdin #stdout 0s 5340KB
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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


The total compound interest earned is: $ 3257.06
https://ideone.com/tfuNFH
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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