Why reverse the order of printf() gives different output?

Question

#include 
int ∗addition(int a, int b){
    int c = a + b ;
    int ∗d = &c ;
    return d ;
}

int main (void) {
   int result = ∗(addition(1, 2));
           


        

Answer 1

You're returning a pointer to a local variable, which gets deallocated after the function exits (and thus invokes undefined behavior).