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  1. #include <stdio.h>
  2. #include <math.h> // Required for pow()
  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 = (principle * rate * time)
  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, calculated based
  16. **               Upon it being passed the principle, rate, and time.
  17. **
  18. ** Parameters:   Principle - The original principal to start with
  19. **               Rate      - The rate of interest.  Example:  9.5% passed as 0.095
  20. **               Time      - The time in years
  21. **
  22. ** Returns:      Interest  - The amount of simple interest earned
  23. **
  24. ********************************************************************/ 
  25.  
  26. // Function prototypes
  27. float Calculate_Simple_Interest(float principle, float rate, float time);
  28. float Calculate_Compound_Interest(float principle, float rate, float time);
  29.  
  30. // Function to calculate simple interest
  31. float Calculate_Simple_Interest(float principle, float rate, float time)
  32. {
  33.  
  34. /* You will only need to create three simple statements here ... */ 
  35. /* No other statements are needed. */  
  36.  
  37. /* TO DO:  Step 1) Define a local variable of type float to hold interest */
  38. /* ... Hint:  This statement is the same of Step 1 in the challenge template */ 
  39.  
  40. /* TO DO: Step 2) Calculate simple interest earned - Determine the  */ 
  41. /* interest using the values in the parameters: principle, rate, and time ... */
  42. /* and assign that value to the local variable you created in step 1 */
  43. /* that holds the interest  */ 
  44. /* .... Hint: This statement is right in the first homework */ 
  45.  
  46. /* TO DO: Step 3) Add a return statement to return the interest to main */
  47. /* ... Hint: This statement is the same of Step 3 in the challenge template */	
  48.  
  49.     float interest;
  50.     interest = principle * rate * time;
  51.     return interest;
  52. }
  53.  
  54. //calculate compound interest
  55. float Calculate_Compound_Interest(float principle, float rate, float time)
  56. {
  57.     float interest;
  58.     interest = (principle * pow(1.0 + rate, time)) - principle;
  59.     return interest;
  60. }
  61.  
  62. int main(void)
  63. {
  64.     float interest;  /* The interest earned over a period of time */
  65.     float principle; /* The amount being invested */ 
  66.     float rate;      /* The interest rate earned */ 
  67.     float time;      /* The years of the investment */
  68.     float interest_compound;
  69.  
  70.     printf("\nEnter your principle value: ");
  71.     scanf("%f", &principle);
  72.  
  73.     printf("\nEnter the rate (e.g. 0.095 for 9.5 percent): ");
  74.     scanf("%f", &rate);
  75.  
  76.     printf("\nEnter the time in years: ");
  77.     scanf("%f", &time);
  78.  
  79.     interest = Calculate_Simple_Interest(principle, rate, time);
  80.  
  81.     printf("\nThe total simple interest earned is: $%.2f\n", interest);
  82.  
  83. /* Challenge:  If you decide to do the challenge, you will need to add code  */
  84. /*            for these two statements ... otherwise, just leave them as is  */
  85. /* Challenge TO DO: Step 1)  Call Calculate_Compound_Interest    */
  86. /* function to calculate compound interest */
  87.  
  88. /* Challenge TO DO: Step 2)  Print the compound interest to the screen */
  89.  
  90.     interest = Calculate_Simple_Interest(principle, rate, time);
  91.     interest_compound = Calculate_Compound_Interest(principle, rate, time);
  92.  
  93.     printf("The total compound interest earned is: $%.2f\n", interest_compound);
  94.  
  95.     return 0;
  96. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
4500
0.095
6
stdout 
Enter your principle value: 
Enter the rate (e.g. 0.095 for 9.5 percent): 
Enter the time in years: 
The total simple interest earned is: $2565.00
The total compound interest earned is: $3257.06
https://ideone.com/JhDZW2
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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