/in/foo.c: In function 'f':
/in/foo.c:2:5: warning: type of 'n' defaults to 'int' [-Wimplicit-int]
 int f(n){
     ^
/in/foo.c:3:1: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
 if(n=1)
 ^~
/in/foo.c:3:1: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
/in/foo.c:5:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(n=2)
  ^~
/in/foo.c:5:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]