Help me why this output ↓↓ ???

Question

#include<stdio.h>
#include<stdlib.h>

int main(){

int x=9;
x%=11;
printf("%d",x);
return 0;
}
//output:9 intead of 0

Answer 1

Why 0?
x%=9 means x = x%11= 9%11 = 9
See here
https://www.sololearn.com/discuss/2988130/?ref=app

Answer 2

it works like this
y=x%a;
if (x<a)
y=x;
else
y=x%a;
example:
y=3%4; //3<4 so y=3
y=4%3; // 4>3 so we get the reminder so y=1