/in/foo.c: In function 'main':
/in/foo.c:7:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if (b = 2 || a % 4 == 0 && a % 100 != 0) {
               ~~~~~~~~~~~^~~~~~~~~~~~~~~
/in/foo.c:7:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if (b = 2 || a % 4 == 0 && a % 100 != 0) {
  ^~