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  1. #include <stdio.h>
  2.  
  3. /*****************************************************************
  4. ** Function:  Calculate_Simple_Interest
  5. **
  6. ** Description:  Simple Interest is the amount of interest
  7. **               calculated by using the formula:
  8. **
  9. **               interest = (P * R * T)
  10. **
  11. **               where P is the principle, r is the rate, and t
  12. **               is the time of the investment
  13. **
  14. **               This function will return the simple interest
  15. **               calculated based upon it being passed the principle,
  16. **               rate, and time.
  17. **
  18. ** Parameters:   Principle - The original principal to start with
  19. **               Rate      - The rate of interest.  If you wanted
  20. **                           9.5 percent it would be passed as 0.095
  21. **               Time      - The time in years
  22. **
  23. ** Returns:      Interest  - The amount of simple interest earned
  24. **
  25. ********************************************************************/
  26.  
  27. float Calculate_Simple_Interest (float principle, float rate, float time) 
  28. { 
  29.  
  30.     // Step 1: Define a local variable to hold interest
  31.     float interest;
  32.  
  33.     // Step 2: Calculate simple interest
  34.     interest = principle * rate * time;
  35.  
  36.     // Step 3: Return the interest
  37.     return interest;
  38. } /* end Calculate_Simple_Interest */ 
  39.  
  40.  
  41. /*****************************************************************
  42. ** Function:  Calculate_Compound_Interest
  43. **
  44. ** Description:  Compound Interest is calculated by the formula:
  45. **
  46. **               amount = principle * (1 + rate)^time
  47. **               compound_interest = amount - principle
  48. **
  49. ** Parameters:   Principle - The original principal to start with
  50. **               Rate      - The rate of interest (e.g. 0.095 for 9.5%)
  51. **               Time      - The time in years
  52. **
  53. ** Returns:      Compound Interest earned
  54. ********************************************************************/
  55. float Calculate_Compound_Interest(float principle, float rate, float time)
  56. {
  57.     float amount = principle * pow(1 + rate, time);
  58.     return amount - principle;
  59. }
  60.  
  61. int main (void) 
  62. { 
  63.     float interest;  /* The interest earned over a period of time */
  64.     float principle; /* The amount being invested */ 
  65.     float rate;      /* The interest rate earned */ 
  66.     float time;      /* The years of the investment */       
  67.  
  68.     /* Initialize the interest value */ 
  69.     interest = 0;
  70.  
  71.     /* Enter values needed to determine interest */ 
  72.     printf ("\nEnter your principle value: "); 
  73.     scanf ("%f", &principle);  
  74.  
  75.     printf ("\nEnter the rate: For example 9.5 percent would be .095: "); 
  76.     scanf ("%f", &rate);  
  77.  
  78.     printf ("\nEnter the period of time of your investment: :"); 
  79.     scanf ("%f", &time); 
  80.  
  81.     /* Call simple interest function to calculate the simple interest */
  82.     interest = Calculate_Simple_Interest (principle, rate, time); 
  83.  
  84.     /* Print the simple interest earned to the screen */ 
  85.     printf ("\n\nThe total simple interest earned is: $%8.2f\n", interest); 
  86.  
  87.     /* Challenge TO DO: Step 1)  Call Calculate_Compound_Interest function */
  88.     /*                           to calculate the compound interest.       */
  89.  
  90.     /* Challenge TO DO: Step 2)  Print the compound interest to the screen */ 
  91.  
  92.     return (0); /* indicate successful completion */
  93.  
  94. } /* end main */
  95.  
Success #stdin #stdout 0.01s 5312KB
comments (?)
stdin 
4500 
0.095 
6
stdout 
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/P5NA3y
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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