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  1.  
  2.  
  3.     #include <stdio.h>
  4.  
  5.     /* global definition of a function prototype */
  6.     /* known to all functions                    */
  7.     int add_two (int, int);
  8.     int double_it (int);
  9.  
  10.     int main ()
  11.     {
  12.  
  13.       int doubled;  /* the result of a number doubled */
  14.       int sum;      /* the sum of two numbers         */
  15.       int val;      /* just a number to work with     */
  16.  
  17.       val = 100;
  18.  
  19.       /* call the functions */
  20.       /* The function prototypes before help the compiler to             */
  21.       /* determine the types each function is passed and what it returns */
  22.       sum = add_two (val, val*5);
  23.       doubled = double_it (val);
  24.  
  25.       printf("sum = %i and doubled = %i\n", sum, doubled);
  26.  
  27.       return(0);
  28.  
  29.     }
  30.  
  31.  
  32.     // **************************************************
  33.     // Function: add_two
  34.     //
  35.     // Description:  Adds to numbers together and returns
  36.     //               their sum.
  37.     //
  38.     // Parameters: num1 - first integer to sum
  39.     //             num2 - second integer to sum
  40.     //
  41.     // Returns:    result - sum of num1 and num2
  42.     //
  43.     // ***************************************************
  44.  
  45.     int add_two (int num1, int num2)
  46.     {
  47.  
  48.        int result;  /* sum of the two number */
  49.  
  50.        result = num1 + num2;
  51.  
  52.        return (result);
  53.  
  54.     }
  55.  
  56.     // **************************************************
  57.     // Function: double_it
  58.     //
  59.     // Description:  Adds to numbers together and returns
  60.     //               their sum.
  61.     //
  62.     // Parameters: num - number to double
  63.     //
  64.     // Returns:    answer - the value of num doubled
  65.     //
  66.     // ***************************************************
  67.     int double_it (int num)
  68.     {
  69.  
  70.        int answer; /* num being doubled */
  71.  
  72.        answer = num + num;
  73.  
  74.        return (answer);
  75.     }
  76.  
  77.  
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
stdout
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sum = 600 and doubled = 200
https://ideone.com/fFpN0c
language:
C (gcc 8.3)
created:
3 hours ago
visibility:
public

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