sum_1st_n _natural_numbers_while.ipynb

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      "ENTER THE RANGE OF N = 10\n",
      "sum of 1st 10 natural numbers is 55 \n"
     ]
    }
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   "source": [
    "# Write a programm to find the sum of the 1st n natural numbers without using formula\n",
    "n = int(input(\"ENTER THE RANGE OF N = \"))\n",
    "sum = 0\n",
    "i = 1\n",
    "while (i <= n):\n",
    "    sum = sum + i\n",
    "    i = i + 1\n",
    "else:\n",
    "    print (\"sum of 1st %d natural numbers is %d \"%(n,sum))"
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