Hi Patrick, In the pre-increment operation explanation, you made a little typo. #include <stdio.h> int main() { int x, y; x = 5 ; y = ++x; printf( "x is equal to %d\n" , x); // x is equal to 6 printf( "y is equal to %d\n" , y); // y is equal to 5 ⚠️ Should be 6 instead. } Correct me if I'm wrong. Thanks for your article by the way!