Question

How to print 2D vector in C++

Answer 1

#include <iostream>
#include <vector>

void Print2DVector(std::vector<std::vector<int>> vec2d) {
    for (std::vector<int> vec1d : vec2d) {
        for (int val : vec1d) {
            std::cout << val << " ";
        }    
        std::cout << "\n";
    }
}

int main() {
    std::vector<std::vector<int>> vec2d {
        { 1, 4, 8, 9 },
        { 0, 7, 1, 3, 40 },
        { 5, 2, 13, 28, 50, 60, 99 }
    };

    Print2DVector(vec2d);
}





/*
run:

1 4 8 9 
0 7 1 3 40 
5 2 13 28 50 60 99 

*/

 

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Answer 2

#include <iostream>
#include <vector>

void Print2DVector(std::vector<std::vector<int>> vec2d) {
    for (int i = 0; i < vec2d.size(); i++) {
        for (int j = 0; j < vec2d[i].size(); j++) {
            std::cout << vec2d[i][j] << " ";
        }    
        std::cout << "\n";
    }
}

int main() {
    std::vector<std::vector<int>> vec2d {
        { 1, 4, 8, 9 },
        { 0, 7, 1, 3, 40 },
        { 5, 2, 13, 28, 50, 60, 99 }
    };

    Print2DVector(vec2d);
}





/*
run:

1 4 8 9 
0 7 1 3 40 
5 2 13 28 50 60 99 

*/

 

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