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  1. #include <stdio.h>
  2.  
  3. int main(void){
  4. 	for(int i = 1, n = 1, d = 1; n <= 8; i += d){
  5. 		if(i == n){
  6. 			d = -d;
  7. 		} else if(i == 0){
  8. 			d = -d;
  9. 			++n;
  10. 			puts("");
  11. 			continue;
  12. 		}
  13. 		printf("%d", i);
  14. 	}
  15. }
Success #stdin #stdout 0s 10320KB
comments (?)
stdin
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Standard input is empty
stdout
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1
121
12321
1234321
123454321
12345654321
1234567654321
123456787654321
https://ideone.com/k60xSk
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
public

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