DC coupled op amp applications are concerned about DC offset voltage as well as gain. Most of the time, it is possible to get gain and offset from a single op amp stage.
|Non-inverting||Gain > 1||Case = 2||Case = 5||Case = 1|
|Gain = 1||Case = 8||Case = 9|
|0 < Gain < 1||Case = 10||Case = 7|
|Gain = 0||Regulators|
|Inverting||-1 < Gain < 0||Case = 12||Case = 13||Case = 11|
|Gain ≤ -1||Case = 4||Case = 6||Case = 3|