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  1. #include <stdio.h>
  2.  
  3. #define TEST_ARR(a) (\
  4.         printf("" #a " is %s\n", \
  5.         is_fib_array(a, sizeof(a) / sizeof(a[0])) ? "fib array" : "not a fib array"))
  6.  
  7. int is_fib_array(int *arr, size_t len)
  8. {
  9.     size_t i;
  10.  
  11.     if (len < 3)
  12.         return 0;
  13.  
  14.     for (i = 2; i < len; i++) {
  15.         if (arr[i - 2] + arr[i - 1] != arr[i])
  16.             return 0;
  17.     }
  18.  
  19.     return 1;
  20. }
  21.  
  22. int main()
  23. {
  24.     int arr0[] = { 1, 1 };
  25.     int arr1[] = { 1, 1, 2, 3, 5, 8, 13 };
  26.     int arr2[] = { 1, 1, 2, 3, 5, 8, 13, 21, 100 };
  27.  
  28.     TEST_ARR(arr0);
  29.     TEST_ARR(arr1);
  30.     TEST_ARR(arr2);
  31.  
  32.     return 0;
  33. }
Success #stdin #stdout 0.01s 1720KB
comments (?)
stdin
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Standard input is empty
stdout
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arr0 is not a fib array
arr1 is fib array
arr2 is not a fib array
https://ideone.com/f6JC4X
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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