/in/foo.c: In function 'main':
/in/foo.c:6:4: warning: statement with no effect [-Wunused-value]
   i==x+y;
   ~^~~~~
/in/foo.c:7:16: error: expected ')' before 'i'
     printf("%d"i);
                ^
/in/foo.c:7:14: warning: format '%d' expects a matching 'int' argument [-Wformat=]
     printf("%d"i);
              ^