C++ loop 1 to 10 then reverse

Question

my output should be:
1
2
3
4
5
6
7
8
9
10
9
8
7
6
5
4
3
2
1
0

this is my code the number 9 is disappearing pls helpp

https://www.sololearn.com/compiler-playground/c3sLQ7r55Q50

Answer 1

For example:
Create a loop from 1 to 10.
Create a loop from 9 to 1.

Please link your code if you want us to test it.

Answer 2

for(int x=1; x<=10; x++) cout << x << endl;
for(int x=9; x>=0; x--) cout << x << endl;