prog.cpp: In function ‘int main()’:
prog.cpp:12:2: error: expected ‘;’ before ‘return’
return 0;
^~~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:15:5: error: redefinition of ‘int main()’
int main() {
^~~~
prog.cpp:6:5: note: ‘int main()’ previously defined here
int main() {
^~~~