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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	//vector<vector<int>> arr={{1,2,3,4},{5,6,7,8},{4,8,9,8}};
  7. 	//for(int i =0 ; i < arr.size();i++){
  8. 	//	for(int j =0; j<arr[i].size();j++){
  9. 	//		cout<<arr[i][j]<<" ";
  10. 	//	}
  11. 	//	cout<<endl;
  12. 	//} this how you traverse 2d vector
  13. 	// if you want to traverse a 2d array then you have use sizeof() function
  14. 	int arr[4][4]={{1,2,3,4},{5,6,7,8},{4,8,9,8}};
  15. 	int n = sizeof(arr)/sizeof(arr[0]);
  16. 	int m = sizeof(arr[0])/sizeof(arr[0][0]);
  17. 	for(int i =0 ; i < n;i++){
  18. 		for(int j =0; j<n;j++){
  19. 			cout<<arr[i][j]<<" ";
  20. 		}
  21. 		cout<<endl;
  22. 	}
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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1 2 3 4 
5 6 7 8 
4 8 9 8 
0 0 0 0
https://ideone.com/5IKF7L
language:
C++14 (gcc 8.3)
created:
6 hours ago
visibility:
public

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