title: error: called object '0' is not a function
body: <p>I'm running into the following error in both functions in the following code:</p>
  
  <pre><code>In function 'Celsius_Converter':
  Line 64: error: called object '0' is not a function
  In function 'Fahrenheit_Converter':
  Line 90: error: called object '1' is not a function
  </code></pre>
  
  <p>Here is my code:</p>
  
  <pre><code>/* 
   *Program Name: COP 2220-10018 Project 3
   *
   * Author: Nathan Gamble
   * 
   * Description: Convert either Celsius to Fahrenheit, or Fahrenheit to Celsius.
   *
   * Input: Celsius or Fahrenheit Temperature
   *
   * Output: Fahrenheit or Celsius, depending on which one the User requested.
   */
  #include &lt;stdio.h&gt;
  #include &lt;math.h&gt;
  
  int main (void)                     
  {
  //Local Declarations
  char choice;
  int fahrenheit;
  int celsius;
  
  
  //Statements
  printf("This program converts Celsius temperature to Fahrenheit degree and     Fahrenheit temperature to Celsius degree. \n");
  printf("If you want to convert Celsius to Fahrenheit, please enter C.");
  printf("If you want to convert Fahrenheit to Celsius, please enter F.");
  scanf("%s", &amp;choice);
  
  //Process
  if (choice == 'C') {
  fahrenheit = Celsius_Converter();
  printf("The temperature in Fahrenheit degree is %d", &amp;fahrenheit);
  }
  
  else {
  celsius = Fahreinheit_Converter();
  printf("The temperature in Celsius degree is %d", &amp;celsius);
  }
  
  
  return 0;
  } // End main
  
  
  /* 
   *Program Name: COP 2220-10018 Project 3
   *
   * Author: Nathan Gamble
   * 
   * Description: Convert Celsius to Fahrenheit
   *
   * Input: Celsius Temperature
   *
   * Output: Fahrenheit
   */
  int Celsius_Converter ()
  {
  //Local Declarations
  double fahrenheit;
  double celsius;
  
  printf("Enter a temperature in Celsius.");
  scanf("%d", &amp;fahrenheit);
  celsius = (5/9) (&amp;fahrenheit - 32);
  return celsius;
  } //end Celsius_Converter
  </code></pre>
  
  
  
  <pre><code>/* 
   *Program Name: COP 2220-10018 Project 3
   *
   * Author: Nathan Gamble
   * 
   * Description: Convert Fahrenheit to Celsius
   *
   * Input: Fahrenheit Temperature
   *
   * Output: Celsius
   */
   int Fahrenheit_Converter ()
  {
  //Local Declarations
  double fahrenheit;
  double celsius;
  
  printf("Enter a temperature in Fahrenheit.");
  scanf("%d", &amp;celsius);
  fahrenheit = (9/5) (&amp;celsius + 32);
  return fahrenheit;
  } //end Fahrenheit_Converter
  </code></pre>