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  1. #include <stdio.h>
  2.  
  3. int main() {
  4. 	int n ; 
  5. 	printf("enter the value of n\n");
  6. 	scanf("%d", &n);
  7. 	int arr [n];
  8. 	for (int i = 0; i <n; i++)
  9. 	{
  10. 	  scanf("%d", &arr[i]);
  11. 	}
  12. 	int flag=0;
  13. 	for (int i = 1; i<n-1; i++)
  14. 	{
  15. 		if(2*arr[i]==arr[i-1]+arr[i+1])
  16. 		{
  17. 		  flag=1;
  18. 		}
  19. 		else
  20. 		{
  21. 			flag=0;
  22. 		}
  23.  
  24. 	}
  25. 	if(flag==1)
  26. 	{
  27. 		printf("it is an A.P \n");
  28. 	}
  29. 	else { 
  30. 		printf( " it is not an A.P");		
  31. 	}
  32.  
  33.  
  34.  
  35. }
  36.  
Success #stdin #stdout 0s 5324KB
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stdin
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6 1 4 7 10 13 14
stdout
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enter the value of n
 it is not an A.P
https://ideone.com/AaUopC
language:
C (gcc 8.3)
created:
3 hours ago
visibility:
public

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