int myfn1() {
int i=10;
return i;
}

char myfn2() {
char buf[10]="Hello";
return buf;
}

int main(){
printf("%dn", myfn1());
printf("%sn", myfn2());
}

10
Segmentation fault

char myfn2() {
buf[10]="Hello";
return buf;
}

char * myfn2() {
buf[10]="Hello";
return buf;
}

int main(void) {
  printf("%pn", (void*) myfn2());  // OK - pointer's value is printed
  printf("%sn", myfn2());          // Bad - code attempts sting access to invalid pointer.
}