/in/foo.c: In function 'main':
/in/foo.c:12:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  while (p = 1) {
  ^~~~~
/in/foo.c:15:4: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    if (i[q] = i[t]) {
    ^~
/in/foo.c:26:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if (p = 2) {
  ^~
/in/foo.c:28:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  } else if (p = 0) {
  ^