using nested printf statements giving strange output

Question

I recently came across this code and I\'m unable to understand how it works

#include
int main(){
    printf(\"Line 1\\n\",
    printf(\"Line 2\\n\         


        

Answer 1

This isn't strange at all. Expressions are evaluated (executed) from within to outside, just like mathematical expressions.

So put it simple terms: the expression with the most parentheses around it is evaluated / executed first.

Simplified it is:

printf("1", printf("2", printf("3", printf("4"))));