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difference between --a and a-- c++

Stryker C++ ved NTNU answered on July 29, 2021 Popularity 9/10 Helpfulness 2/10

answer difference between --a and a-- c++

related what is the difference between * and & in c++

difference between --a and a-- c++

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// The difference is here:

int a = 0;
int b = a++; // b = 0, a = 1 

// Where

int a = 0;
int b = ++a; // b = 1, a = 1

Popularity 9/10 Helpfulness 2/10 Language cpp

Source: www.cplusplus.com

Tags: between c++ difference

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Contributed on Jul 29 2021

Stryker C++ ved NTNU

0 Answers Avg Quality 2/10

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what is the difference between * and & in c++

Comments(1)

/*Difference between * and & in c++
you have to execute this code in your computer to undrestand otherwise this is not  making sense
you can use online  compilers such as 
https://www.programiz.com/cpp-programming/online-compiler/
or
https://www.onlinegdb.com/online_c++_compiler
*/

#include <iostream>

using namespace std;

int main() {
    int val = 5;
    int& rref = val;
    int* ptr = &val;
    
    cout<<"in main"          << endl
        << "val   =  "   << val   << endl
        << "&val  =  "   << &val  << endl
        << "rref  =  "   << rref  << endl
        << "&rref =  "   << &rref << endl
        << "ptr   =  "   << ptr   << endl
        << "*ptr  =  "   << *ptr  << endl
        << "&ptr  =  "   << &ptr  << endl;
/*

in main
val   =  5
&val  =  0x7ffd32ad1354
rref  =  5
&rref =  0x7ffd32ad1354
ptr   =  0x7ffd32ad1354
*ptr  =  5
&ptr  =  0x7ffd32ad1348

in the aspect of the appearance of code and understanding the code via the way
it looks like
this example shows that in c++ mentioning the name of rref in a function such
as cout<< is equivalent to the original value (val==rref)
and mentioning &rref is equivalent to address of original
((&val) or (&val==&rref))
while
mentioning the name of ptr is equivalent to address of original
((&val) or (&val==ptr))
and mentioning *ptr is equivalent to the original value (val==*ptr)
however, there is one more : that is &ptr that is not equivalent to any of those
in the above. 
by some thinking even without reading from books and written we can come this
point that : probably that is because pointer variable itself has an extra
allocation compare to reference therefore in another language pointer is a
Reference to reference (somehow, even if not exactly)
terminologies might not be enough accurate and precise … please try to 
rethink it.
*/
    return 0;
}

Popularity 7/10 Helpfulness 4/10 Language cpp

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Tags: between c++ difference

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Contributed on Aug 04 2023

Xanthous Xenomorph

0 Answers Avg Quality 2/10

difference between --a and a-- c++

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difference between --a and a-- c++

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what is the difference between * and & in c++

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