/in/foo.c: In function 'main':
/in/foo.c:6:18: warning: left-hand operand of comma expression has no effect [-Wunused-value]
    6 |         for(i=2;i,n;i++)
      |                  ^
/in/foo.c:8:17: warning: parameter names (without types) in function declaration
    8 |                 int f(i)=f(i-1)+f(i-2);
      |                 ^~~
/in/foo.c:8:17: error: function 'f' is initialized like a variable
/in/foo.c:13:17: warning: implicit declaration of function 'f' [-Wimplicit-function-declaration]
   13 |                 f(i)=f(i-1)+f(i-2);
      |                 ^
/in/foo.c:13:21: error: lvalue required as left operand of assignment
   13 |                 f(i)=f(i-1)+f(i-2);
      |                     ^