While loop

Question

I did this

Int x = 1;
While (x<=15) {
Cout << "this is a loop" << endl;
X+= x++;

Then the loop ran only 4 times
I want to know why

Answer 1

Your whole code is this :
#include <iostream>
using namespace std;

int main() {

int x = 1;
while (x<=15) {
cout<< "this is a loop" << endl;
x+= x++;
}
return 0;

}

Here 1st run of loop :
x+=x++
x++=2
so
x+=2
Which is 3
Now x=3
2nd run of loop :
x+=x++
3+=4
Now x=7

3rd run
x+=x++
7+=8
That is 15

Now x=15

4th run :
15+=16
x=31
Which is greater than 15
Code Stops

Thanks

Answer 2

Not sure about Java or other languages, but if this is C/C++, expressions like x += x++ lead to undefined behavior and must be avoided.

/Edit: ok, cout. It is C++ 🤓

Answer 3

1: x += x++ //x = 3
2: x += x++ //x = 7
3: x += x++ //x = 15
4: x += x++ //x = 31

Answer 4

Its c++