How to Iterate over a Two Dimensional Vector in C++

◀ Previous Next ▶

How to Iterate over a Two Dimensional Vector in C++ ?

Answer

To iterate over a two-dimensional vector in C++, you can use nested loops.

✐ Examples

1 Iterate over a Numeric Two-Dimensional Vector

In this example,

We use nested for loops to iterate over each element of the two-dimensional vector.
The outer loop iterates over the rows, and the inner loop iterates over the columns.
Finally, we print each element of the two-dimensional vector to standard output.

C++ Program

#include <iostream>
#include <vector>

int main() {
    // Step 1: Iterate over a numeric two-dimensional vector
    std::vector<std::vector<int>> matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    
    // Step 2: Nested loops to print each element
    for (const auto& row : matrix) {
        for (int num : row) {
            std::cout << num << " ";
        }
    }
    
    return 0;
}

Output

1 2 3 4 5 6 7 8 9

2 Iterate over a String Two-Dimensional Vector

In this example,

We use nested for loops to iterate over each element of the two-dimensional vector.
The outer loop iterates over the rows, and the inner loop iterates over the columns.
Finally, we print each element of the two-dimensional vector to standard output.

C++ Program

#include <iostream>
#include <vector>
#include <string>

int main() {
    // Step 1: Iterate over a string two-dimensional vector
    std::vector<std::vector<std::string>> matrix = { {"a", "b", "c"}, {"d", "e", "f"}, {"g", "h", "i"} };
    
    // Step 2: Nested loops to print each element
    for (const auto& row : matrix) {
        for (const std::string& str : row) {
            std::cout << str << " ";
        }
    }
    
    return 0;
}

Output

a b c d e f g h i

Summary

In this tutorial, we learned How to Iterate over a Two Dimensional Vector in C++ language with well detailed examples.

◀ Previous Next ▶

C++ Tutorials

C++ How-Tos

How to Iterate over a Two Dimensional Vector in C++

How to Iterate over a Two Dimensional Vector in C++ ?

Answer

✐ Examples

1 Iterate over a Numeric Two-Dimensional Vector

C++ Program

Output

2 Iterate over a String Two-Dimensional Vector

C++ Program

Output

Summary

More C++ Vectors Tutorials