Resizing Dynamic Array

Question:

int num = 50;int **stuff;stuff = new int* [num];for (int i = 0 ; i < num ; ++i)      stuff[i] = new int [num];

The code above is copied from another question. Say the above array is a matrix where each row has a number of columns, how do you increase the size of the array to add another row?

Answer:
While many people like to use new and delete to manage memory, they don't give you much control. The old C favorites, malloc(), free(), and friends, are still helpful in C++.

Memory allocated with malloc() can be resized using realloc(). The only disadvantage is that, if you have an array of class objects, the constructors are not automatically called for each object in the array. Similarly, the destructors are not automatically called on objects when you call free(). However, in cases such as yours where the array is simply of integers, this is not an issue.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS