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   "source": [
    "### Q1 : Write a python program to print the square of all numbers from 0 to 10."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "### START CODE HERE ###\n",
    "\n",
    "for i in range(11):\n",
    "    print(f\"Square of {i} = {i**2}\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q2 : Suppose we have a list of integers\n",
    "> `numbers = [1, 2, 3, 4, 5, 6]`\n",
    "- How to add 5 to each number?\n",
    "- What if we want to add 5 to only the second to the fifth number?\n",
    "- What if we want to add 5 to numbers with only even-numbers?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "### START CODE HERE ###\n",
    "\n",
    "numbers = [1, 2, 3, 4, 5, 6]\n",
    "\n",
    "# for i in range(len(numbers)):\n",
    "#     numbers[i]+=5\n",
    "# print(numbers)\n",
    "\n",
    "# for i in range(2,len(numbers),3):\n",
    "#     numbers[i] += 5\n",
    "# print(numbers)\n",
    "\n",
    "# for i in range(1, len(numbers), 2):\n",
    "#     numbers[i] += 5\n",
    "# print(numbers)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q3 : Write a Python program that accepts a word from the user and reverse it."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "### START CODE HERE ###\n",
    "\n",
    "word = input(\"Input a word to reverse: \")\n",
    "\n",
    "for char in range(len(word) - 1, -1, -1):\n",
    "    print(word[char], end=\"\")\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q : Write a program to reverse a given integer number."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "num = int(input(\"Input an integer to reverse: \"))\n",
    "reverse_number = 0\n",
    "print(\"Given Number \", num)\n",
    "while num > 0:\n",
    "    remainder = num % 10\n",
    "    reverse_number = (reverse_number * 10) + remainder\n",
    "    num = num // 10\n",
    "print(\"Revered Number \", reverse_number)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q4 : There are two lists - first contains students' names and second list contains their corresponding marks.\n",
    "> `students = [\"Kevin\", \"Zara\", \"Tom\", \"Chris\", \"Pritam\", \"Mike\"]`\n",
    "\n",
    "> `scores = [80, 76, 92, 55, 81, 72]`\n",
    "- Print each student's name and his/her corresponding marks in each line."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "### START CODE HERE ###\n",
    "\n",
    "students = [\"Kevin\", \"Zara\", \"Tom\", \"Chris\", \"Pritam\", \"Mike\"]\n",
    "scores = [80, 76, 92, 55, 81, 72]\n",
    "\n",
    "for i in zip(students, scores):\n",
    "    print(f\"{i[0]} has scored {i[1]}.\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q5 : Use a for loop to display elements from a given list which are present at even positions."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "### START CODE HERE ###\n",
    "\n",
    "my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]\n",
    "for i in my_list[1::2]:\n",
    "    print(i, end=\" \")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q6: Write a Python program which takes two digits m (row) and n (column) as input and generates a two-dimensional array. The element value in the i-th row and j-th column of the array should be `i*j`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "### START CODE HERE ###\n",
    "\n",
    "row_num = int(input(\"Input number of rows: \"))\n",
    "col_num = int(input(\"Input number of columns: \"))\n",
    "multi_list = [[0 for col in range(col_num)] for row in range(row_num)]\n",
    "\n",
    "for row in range(row_num):\n",
    "    for col in range(col_num):\n",
    "        multi_list[row][col]= row*col\n",
    "\n",
    "multi_list"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q7 : Write a function called digit_sum that takes a positive integer n as input and returns the sum of all that number's digits."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "### START CODE HERE ###\n",
    "\n",
    "number = input(\"Enter an integer number: \")\n",
    "count=0\n",
    "for num in number:\n",
    "    n = int(num)\n",
    "    count += n\n",
    "\n",
    "print(count)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q8 : Write an interactive program that takes a number from user to calculate factorial of that number.¶"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# n! = n * (n - 1) * (n - 2) * .......* 3 * 2 * 1\n",
    "# 0! = 1; 1! = 1\n",
    "\n",
    "### START CODE HERE ###\n",
    "\n",
    "number = int(input(\"Enter an integer number: \"))\n",
    "\n",
    "factorial = 1\n",
    "if number < 0:\n",
    "    print(\"Please provide a positive integer.\")\n",
    "elif number <= 1:\n",
    "    print(f\"Factorial of {number} = 1.\")\n",
    "else:\n",
    "    for i in range(2, number+1):\n",
    "        factorial *= i\n",
    "    print(f\"Factorial of {number} = {factorial}.\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Using a while loop"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Using recursive function"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Q9 : Write a program that takes an integer n as argument and return the n-th Fibonacci term. If n is negative then the function should return nothing.\n",
    "\n",
    "<img src=\"fibonacci-sequence.png\">\n",
    "<img src=\"images.png\">\n",
    "<img src=\"fibbo.png\">"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "### START CODE HERE ###\n",
    "\n",
    "number = int(input(\"Enter an integer number: \"))\n",
    "\n",
    "def fib(n):\n",
    "    first, second = 0, 1\n",
    "    if n == 0:\n",
    "        return 0\n",
    "    for i in range(n-1):\n",
    "        first, second = second, first + second\n",
    "    return second\n",
    "\n",
    "fib(number)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Using recursive function"
   ]
  }
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