// C program to demonstrate working of // __attribute__((constructor)) and // __attribute__((destructor)) #include // Assigning functions to be executed before and // after main() void __attribute__((constructor)) calledFirst(); void __attribute__((destructor)) calledLast(); void main() {  printf('nI am in main'); } // This function is assigned to execute before // main using __attribute__((constructor)) void calledFirst() {  printf('nI am called first'); } // This function is assigned to execute after // main using __attribute__((destructor)) void calledLast() {  printf('nI am called last'); }