if-elif-elsemarks = int(input("Enter marks: "))\nif marks >= 90:\n print("A Grade")\nelif marks >= 75:\n print("B Grade")\nelif marks >= 60:\n print("C Grade")\nelse:\n print("Fail")Nested ifif age >= 18:\n if has_id:\n print("Can vote")\n else:\n print("Need ID")\nelse:\n print("Too young")