/in/foo.c:3:14: error: expected ';', ',' or ')' before '&' token
 int read(int &j){
              ^
/in/foo.c: In function 'main':
/in/foo.c:24:2: warning: implicit declaration of function 'read' [-Wimplicit-function-declaration]
  int j=1,k=read(j);
  ^