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Aprenda Dynamic Allocation of the Array | Dynamic Memory Allocation
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Dynamic Allocation of the Array

Before we explore why dynamic allocation is necessary, let's quickly recap the characteristics of static and dynamic arrays:

  • Fixed Size : Once declared, the size of a static array is fixed and cannot be changed during runtime;

  • Memory Allocation at Compile Time : The memory required for a static array is allocated at compile time.

  • Resizable : Dynamic arrays allow for resizing during runtime, providing flexibility to adapt to changing program requirements;

  • Memory Allocation at Runtime : Memory for dynamic arrays is allocated during program execution.

The Limitations of a Static Approach

Consider the program that prompts the user to input performance scores for each day that has passed in current month.

Unfortunately, we can't achieve this using a static array:

cpp

main

copy
12345678910
#include <iostream> #include <ctime> int main() { std::time_t currentTime = std::time(nullptr); int day_passed = std::localtime(&currentTime)->tm_mday; int arr[day_passed]; std::cout << day_passed << std::endl; }

Note

This will generate a compilation error because day_passed is not a constant expression it depends on the runtime value of the current day of the month.

So instead of static array we have to use a dynamic allocated array.

Tarefa

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  • Create a dynamic array with a size equivalent to the number of days that have passed.
  • Free allocated memory.

Solução

cpp

solution

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book
Dynamic Allocation of the Array

Before we explore why dynamic allocation is necessary, let's quickly recap the characteristics of static and dynamic arrays:

  • Fixed Size : Once declared, the size of a static array is fixed and cannot be changed during runtime;

  • Memory Allocation at Compile Time : The memory required for a static array is allocated at compile time.

  • Resizable : Dynamic arrays allow for resizing during runtime, providing flexibility to adapt to changing program requirements;

  • Memory Allocation at Runtime : Memory for dynamic arrays is allocated during program execution.

The Limitations of a Static Approach

Consider the program that prompts the user to input performance scores for each day that has passed in current month.

Unfortunately, we can't achieve this using a static array:

cpp

main

copy
12345678910
#include <iostream> #include <ctime> int main() { std::time_t currentTime = std::time(nullptr); int day_passed = std::localtime(&currentTime)->tm_mday; int arr[day_passed]; std::cout << day_passed << std::endl; }

Note

This will generate a compilation error because day_passed is not a constant expression it depends on the runtime value of the current day of the month.

So instead of static array we have to use a dynamic allocated array.

Tarefa

Swipe to start coding

  • Create a dynamic array with a size equivalent to the number of days that have passed.
  • Free allocated memory.

Solução

cpp

solution

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 4. Capítulo 3
Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Sentimos muito que algo saiu errado. O que aconteceu?
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