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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. /*------------------------------------------------------------
  5.   Function: Calculate_Simple_Interest
  6.   Description: Returns simple interest using the formula
  7.                I = P * r * t
  8.   Parameters:
  9.       principle – original amount invested (P)
  10.       rate      – annual interest rate as a decimal (r)
  11.       time      – investment period in years (t)
  12.   Returns:
  13.       Interest earned over the period
  14. ------------------------------------------------------------*/
  15. float Calculate_Simple_Interest(float principle, float rate, float time)
  16. {
  17.     /* Step 1 – local variable to hold the result */
  18.     float interest = 0.0f;
  19.  
  20.     /* Step 2 – compute simple interest */
  21.     interest = principle * rate * time;
  22.  
  23.     /* Step 3 – return the value to the caller */
  24.     return interest;
  25. }
  26.  
  27. /*------------------------------------------------------------
  28.   Function: Calculate_Compound_Interest
  29.   Description: Returns compound interest using the formula
  30.                I = P*(1 + r)^t – P
  31.   Parameters:
  32.       principle – original amount invested (P)
  33.       rate      – annual interest rate as a decimal (r)
  34.       time      – investment period in years (t)
  35.   Returns:
  36.       Compound interest earned over the period
  37. ------------------------------------------------------------*/
  38. float Calculate_Compound_Interest(float principle, float rate, float time)
  39. {
  40.     /* Challenge Step 1 – local variable */
  41.     float interest = 0.0f;
  42.  
  43.     /* Challenge Step 2 – compute compound interest */
  44.     interest = (float)(principle * powf(1.0f + rate, time) - principle);
  45.  
  46.     /* Challenge Step 3 – return the value */
  47.     return interest;
  48. }
  49.  
  50. int main(void)
  51. {
  52.     float principle = 0.0f;
  53.     float rate      = 0.0f;
  54.     float time      = 0.0f;
  55.     float simple_interest   = 0.0f;
  56.     float compound_interest = 0.0f;
  57.  
  58.     /* Prompt for user input */
  59.     printf("Enter your principle value: ");
  60.     scanf("%f", &principle);
  61.  
  62.     printf("Enter the rate (e.g., 9.5%% as 0.095): ");
  63.     scanf("%f", &rate);
  64.  
  65.     printf("Enter the period of time of your investment (years): ");
  66.     scanf("%f", &time);
  67.  
  68.     /* Calculate and display simple interest */
  69.     simple_interest = Calculate_Simple_Interest(principle, rate, time);
  70.     printf("\nThe total simple interest earned is: $%8.2f\n", simple_interest);
  71.  
  72.     /* Calculate and display compound interest */
  73.     compound_interest = Calculate_Compound_Interest(principle, rate, time);
  74.     printf("\nThe total compound interest earned is: $%8.2f\n", compound_interest);
  75.  
  76.     return 0;
  77. }
  78.  
Success #stdin #stdout 0s 5292KB
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stdin
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4500 
0.095 
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stdout
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Enter your principle value: Enter the rate (e.g., 9.5% as 0.095): Enter the period of time of your investment (years): 
The total simple interest earned is: $ 2565.00

The total compound interest earned is: $ 3257.06
https://ideone.com/9xIXU0
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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