Post increment C++ Output

Asked Apr 20 '20 at 10:12

Active Apr 20 '20 at 10:12

Viewed 34 times

#include<iostream>
using namespace std;
int main()
{
    int a=5, b;
    cout<<a++<<endl<<a++<<endl<<++a<<endl<<++a<<endl<<++a<<endl<<a++<<endl<<a++<<endl<<a++<<endl<<a++<<endl<<++a;
    return 0;
}

OUTPUT: 14 13 15 15 15 9 8 7 6 15

Can someone explain how the compiler got this output? I understood the pre-increment will be 15. But can someone explain how we're getting these post-increment values?

asked Apr 20 '20 at 10:12

Faraz Suhail

GCC warns that this operation invokes *undefined behavior*: https://godbolt.org/z/qiygDh – UnholySheep Apr 20 '20 at 10:19
It's a classical undefined-behavior program that MSVC and GCC generate different outputs. – jerry_fuyi Apr 20 '20 at 12:12
This doesn't address the question, but you really don't need all the extra stuff from all those `std::endl`s. `'\n'` ends a line. – Pete Becker Apr 20 '20 at 13:17
but there might be some explanation for this undefined behavior? – Faraz Suhail Apr 20 '20 at 14:41

Post increment C++ Output

0 Answers0