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C++ array decay

VARAK-VURAK answered on January 9, 2023 Popularity 4/10 Helpfulness 1/10

answer C++ array decay

C++ array decay

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// C++ code to demonstrate array decay
#include<iostream>
using namespace std;
  
// Driver function to show Array decay
// Passing array by value
void aDecay(int *p)
{
    // Printing size of pointer
    cout << "Modified size of array is by "
            " passing by value: ";
    cout << sizeof(p) << endl;
}
  
// Function to show that array decay happens 
// even if we use pointer
void pDecay(int (*p)[7])
{
    // Printing size of array
    cout << "Modified size of array by "
            "passing by pointer: ";
    cout << sizeof(p) << endl;
}
  
int main()
{
    int a[7] = {1, 2, 3, 4, 5, 6, 7,};
  
    // Printing original size of array
    cout << "Actual size of array is: ";
    cout << sizeof(a) <<endl;
  
    // Passing a pointer to array
    aDecay(a);
      
    // Calling function by pointer
    pDecay(&a);   
  
    return 0;
}
/*
Actual size of array is: 28
Modified size of array by passing by value: 8
Modified size of array by passing by pointer: 8
*/
// C++ code to demonstrate prevention of
// decay of array
#include<iostream>
using namespace std;
  
// A function that prevents Array decay
// by passing array by reference
void fun(int (&p)[7])
{
    // Printing size of array
    cout << "Modified size of array by "
            "passing by reference: ";
    cout << sizeof(p) << endl;
}
  
int main()
{
    int a[7] = {1, 2, 3, 4, 5, 6, 7,};
  
    // Printing original size of array
    cout << "Actual size of array is: ";
    cout << sizeof(a) <<endl;
  
    // Calling function by reference
    fun(a);
  
    return 0;
}
/*
Actual size of array is: 28
Modified size of array by passing by reference: 28
*/

Popularity 4/10 Helpfulness 1/10 Language cpp

Source: www.geeksforgeeks.org

Tags: c++

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Contributed on Jan 09 2023

VARAK-VURAK

0 Answers Avg Quality 2/10

C++ array decay

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