/in/foo.cc:3:1: error: expected identifier before 'int'
 int main()
 ^
/in/foo.cc:3:1: error: expected ';' before 'int'
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:20: warning: ignoring return value of 'int system(const char*)', declared with attribute warn_unused_result [-Wunused-result]
     system("pause");
                    ^