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  1. import 'dart:io';
  2.  
  3. void main() {
  4. 	pattern(-15);
  5.  
  6.  
  7. }
  8. void pattern(int n) {
  9. 	if(n<3 || n%2 == 0){
  10. 		print("Kindly Enter Valid Number");
  11. 		return;
  12. 	}
  13. 	print("working");
  14. 	String pattern = " " * (n-1);
  15. 	int a =( n~/2 +1);
  16. 	print("$a");
  17. 	String fronPattern1 = "";
  18. 	String starPattern = "*" * (n-1);
  19. 	for(int i=0;i<n+2;i++){
  20. 			fronPattern1 = "";
  21.  
  22.  
  23. 		if(i==(n+2-1)){
  24. 	// print(starPattern);
  25. 	pattern = starPattern;
  26.  
  27. 		}
  28. 		if(a==i){
  29. 			fronPattern1 = "*"*n;
  30. 		}
  31.  
  32.  
  33. 		if(i==0){
  34. 			fronPattern1 = "*"*(n+2);
  35. 		}
  36. 		// else{
  37. 		// 	fronPattern1 = "";
  38. 		// }
  39. 		// else{
  40. 		// 		print(pattern);}
  41. 					print("${pattern}e${fronPattern1}");
  42.  
  43.  
  44. 		// for(int j= 0; j<n+2;j++){
  45. 			// print("${pattern}e");
  46. 		// }
  47. 	}
  48.  
  49. }
Success #stdin #stdout 1.24s 128724KB
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stdin
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Standard input is empty
stdout
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Kindly Enter Valid Number
https://ideone.com/tUTJxi
language:
Dart (dart 2.3.0)
created:
279 days ago
visibility:
public

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