Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.
Aprenda Dynamic Allocation of the Array | Dynamic Memory Allocation
C++ Pointers and References

Deslize para mostrar o menu

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:

main.cpp

main.cpp

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

solution.cpp

solution.cpp

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
single

single

Pergunte à IA

expand

Pergunte à IA

ChatGPT

Pergunte o que quiser ou experimente uma das perguntas sugeridas para iniciar nosso bate-papo

close

Awesome!

Completion rate improved to 5.88

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:

main.cpp

main.cpp

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

solution.cpp

solution.cpp

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!

close

Awesome!

Completion rate improved to 5.88

Deslize para mostrar o menu

some-alt