How To Make A Table In C++

To create a table in C++, you can use a 2D array or a vector of vectors.

2D array example:

#include <iostream>

int main() {
    const int ROWS = 3, COLS = 4;
    int table[ROWS][COLS];
    
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            table[i][j] = i * COLS + j;
            std::cout << table[i][j] << " ";
        }
        std::cout << std::endl;
    }
    return 0;
}

Vector of vectors example:

#include <iostream>
#include <vector>

int main() {
    const int ROWS = 3, COLS = 4;
    std::vector<std::vector<int>> table(ROWS, std::vector<int>(COLS));
    
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            table[i][j] = i * COLS + j;
            std::cout << table[i][j] << " ";
        }
        std::cout << std::endl;
    }
    return 0;
}

Both examples create a table with ROWS number of rows and COLS number of columns, and fill the cells with values calculated from the indices.

In both examples, the table is filled with values calculated from the indices, and then printed to the console. To access an individual cell, you can use the table[i][j] syntax, where i is the row index and j is the column index.

It's important to note that in C++ arrays have a fixed size, determined at compile time, and cannot be resized. On the other hand, vectors are dynamic arrays that can be resized at runtime.

In general, vectors are preferred over arrays in C++, especially when you don't know the size of the data beforehand, or when you need to frequently change the size of the data.

Create a Table in C++

This article discusses how to make a table in C++ using the iomanip library. We will discuss the setw() and setfill() methods of the iomanip library that help in proper formatting in the table.

Delft StackAditya Raj

Frequently Asked Questions About The Error

What causes "subscript out of range" error?

This error occurs when you try to access an index that is outside the bounds of the array or vector. Make sure to check the size of the array or vector before accessing its elements.

What is the difference between a 2D array and a vector of vectors in C++?

A 2D array has a fixed size, determined at compile time, and cannot be resized. On the other hand, a vector of vectors is a dynamic array that can be resized at runtime. In general, vectors are preferred over arrays in C++.

What is a "segmentation fault"?

A segmentation fault is a runtime error that occurs when a program tries to access memory that it is not allowed to access. This can happen if you try to access an index that is outside the bounds of an array or vector, or if you try to access a null pointer.

How do I debug "segmentation fault" error?

To debug a segmentation fault error, you can use a debugger like gdb to find the source of the problem. You can also add print statements to the code to trace the execution and see where the error occurs.

How do I handle invalid input in a table?

To handle invalid input in a table, you can add error checking to your code. For example, you can check the bounds of the indices before accessing the elements of the table. You can also validate the input data before storing it in the table.