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  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.  
  40.     /* 2) TO DO: Step 2) Calculate simple interest earned - Determine the */ 
  41.     /* interest using the values in the parameters: principle, rate, and  */ 
  42.     /* time ... and assign that value to the local variable you created   */
  43.     /* in Step 1 that holds the interest                                  */ 
  44.     /* .... Hint: This statement is right in the first homework           */ 
  45.  
  46.  
  47.     /* 3) TO DO: Step 3) Add a return statement to return the interest */
  48.     /*                   calculated to main                            */ 
  49.  
  50. } /* end Calculate_Simple_Interest */ 
  51.  
  52. /*****************************************************************
  53. ** Function:  Calculate_Compound_Interest
  54. **
  55. ** Description:  Compound Interest is the amount of interest
  56. **               calculated by using the formula:
  57. **
  58. **               interest = (P * pow (1.0 + r, t)) - P
  59. **
  60. **               where P is the principle, r is the rate, and t
  61. **               is the time of the investment
  62. **
  63. **               This function will return the compound interest
  64. **               calculated based upon it being passed the principle,
  65. **               rate, and time.
  66. **
  67. ** Parameters:   Principle - The original principal to start with
  68. **               Rate      - The rate of interest.  If you wanted
  69. **                           9.5 percent it would be passed as 0.095
  70. **               Time      - The time in years
  71. **
  72. ** Returns:      Interest  - The amount of compound interest earned
  73. **
  74. ********************************************************************/
  75.  
  76. float Calculate_Compound_Interest (float principle, float rate, float time)
  77. {
  78.     /* 1) define a local variable of type float to hold the interest */
  79.     float interest;
  80.     float rate;
  81.     float time;
  82.  
  83.     /* 2) TO DO:  calculate compound interest earned ...           */
  84.     /* Set interest variable to the right formula value, see above */
  85.  
  86.     /* 3) return the interest calculated back to the calling function */
  87.     return (interest);
  88.  
  89. } /* end Calculate_Compound_Interest */
  90.  
  91. int main (void) 
  92. { 
  93.     float interest;  /* The interest earned over a period of time */
  94.     float principle; /* The amount being invested */ 
  95.     float rate;      /* The interest rate earned */ 
  96.     float time;      /* The years of the investment */ 
  97.  
  98.     /* Initialize the interest value */ 
  99.     interest = 0;
  100.  
  101.     /* Enter values needed to determine interest */ 
  102.     printf ("\nEnter your principle value: "); 
  103.     scanf ("%f", &principle); 
  104.  
  105.     printf ("\nEnter the rate: For example 9.5 percent would be .095: "); 
  106.     scanf ("%f", &rate); 
  107.  
  108.     printf ("\nEnter the period of time of your investment: :"); 
  109.     scanf ("%f", &time); 
  110.  
  111.     interest = Calculate_Simple_Interest (principle, rate, time); 
  112.  
  113.     /* print the simple interest earned to the screen */ 
  114.     printf("\n\nThe total simple interest earned is: $%8.2f\n", interest); 
  115.  
  116.     /* Call the Calculate_Compound_Interest function and print that     */
  117.     /* interest here if you decide to do the challenge ... it is called */
  118.     /* just like the Calculate_Simple_Interest function and printed     */
  119.     /* the same way.                                                    */
  120.  
  121.     return (0); /* indicate successful completion */
  122.  
  123. } /* end main */
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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4500 
0.095 
6
compilation info 
prog.c: In function ‘Calculate_Compound_Interest’:
prog.c:80:11: error: ‘rate’ redeclared as different kind of symbol
     float rate;
           ^~~~
prog.c:76:59: note: previous definition of ‘rate’ was here
 float Calculate_Compound_Interest (float principle, float rate, float time)
                                                     ~~~~~~^~~~
prog.c:81:11: error: ‘time’ redeclared as different kind of symbol
     float time;
           ^~~~
prog.c:76:71: note: previous definition of ‘time’ was here
 float Calculate_Compound_Interest (float principle, float rate, float time)
                                                                 ~~~~~~^~~~
prog.c:81:11: warning: unused variable ‘time’ [-Wunused-variable]
     float time;
           ^~~~
prog.c:80:11: warning: unused variable ‘rate’ [-Wunused-variable]
     float rate;
           ^~~~
prog.c: In function ‘Calculate_Simple_Interest’:
prog.c:50:1: warning: control reaches end of non-void function [-Wreturn-type]
 } /* end Calculate_Simple_Interest */
 ^
prog.c: In function ‘main’:
prog.c:103:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%f", &principle);
     ^~~~~~~~~~~~~~~~~~~~~~~~
prog.c:106:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%f", &rate);
     ^~~~~~~~~~~~~~~~~~~
prog.c:109:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%f", &time);
     ^~~~~~~~~~~~~~~~~~~
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https://ideone.com/bTQIHc
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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