Question

How to print two dimensional (2D) vector in C++

Answer 1

#include <iostream>
#include <vector>
    
int main ()
{
    std::vector<std::vector<int>> v {
        {1, 2, 3, 4},
        {5, 6, 7, 8},
        {45, 77, 99, 100}
    };
  
    for (int i = 0; i < v.size(); i++) {
        for (int j = 0; j < v[i].size(); j++) {
            std::cout << v[i][j] << " ";
        }
        std::cout << "\n";
    }
  
    return 0;
}
     
     
     
     
/*
run:
   
1 2 3 4 
5 6 7 8 
45 77 99 100 
      
*/

 

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Answer 2

#include <iostream>
#include <vector>

template<class T>
void printVector(std::vector<std::vector<T>> const &v) {
	for (std::vector<T> row: v) {
		for (T n: row) {
			std::cout << n << " ";
		}
		std::cout << '\n';
	}
}
    
int main ()
{
    std::vector<std::vector<int>> v {
        {1, 2, 3, 4},
        {5, 6, 7, 8},
        {45, 77, 99, 100}
    };
  
    printVector(v);
  
    return 0;
}
     
     
     
     
/*
run:
   
1 2 3 4 
5 6 7 8 
45 77 99 100 
      
*/

 

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