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  1. #include <stdio.h>
  2. #include <memory>
  3.  
  4. int main() {
  5. 	const int nrows = 4, ncols = 5;
  6. 	const int dx = 2, dy = 1;
  7. 	int a[4][5] = { {1, 2, 3, 4, 5}, 
  8. 		{ 6, 7, 8, 9, 10 },
  9. 		{ 11, 12, 13, 14, 15 },
  10. 		{ 16, 17, 18, 19, 20 }
  11. 	};
  12. 	int tmp[4][5];
  13. 	for (int i = 0; i < nrows; i++)
  14. 		for (int j = 0; j < ncols; j++)
  15. 			tmp[(i + dx) % nrows][(j + dy) % ncols] = a[i][j];
  16. 	memcpy(a, tmp, sizeof(tmp));
  17. 	for (int i = 0; i < nrows; i++)
  18. 		for (int j = 0; j < ncols; j++)
  19. 			printf(j < ncols - 1 ? "%3d " : "%3d\n", a[i][j]);
  20. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function 'int main()':
prog.cpp:16:28: error: 'memcpy' was not declared in this scope
  memcpy(a, tmp, sizeof(tmp));
                            ^
stdout
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Standard output is empty
https://ideone.com/MKDYav
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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