Case Input Output Status 1 4+(72/8-3)*3/2 4 72 8 / 3 - 3 * 2 / + Working 2 (2+3)*2+3 2 3 + 2 * 3 + Working 3 2*3+3 2 3 * 3 + Working 4 a+(b/c-d)*e/f a b c / d - e * f / + Working