In this article, the given task is to add the first and last digits of an integer. Now integers can be very small or very large. Therefore, these plans will be divided into two parts. First, we need to find how big this integer is and then get the first number from it. The second part is to get the last number from the given integer, this can be easily done by dividing the number by ten and finding the remainder. In this Python article, we show how to add the first and last digits of an integer using four different examples.
In the first example, use repeated division by 10 to get the number of digits in an integer. In Example 2, math.log10() is used to get the number of digits of an integer. In Example 3, the integer is converted to a string to find its length; in Example 4, the integer is first converted to a string and then the index values 0 and -1 are used to get the first and last numbers. Then add the first and last numbers to get the result.
Step 1 - Write a countDigits function to count the number of digits in an integer.
Step 2 - Use the repeated division method.
Step 3 - Now divide the integer by 10**count to get the first number.
Step 4 - Get the last number by dividing by 10 and taking the remainder.
Step 5 - Add the first and last numbers.
Step 6 - Do this for numbers of different lengths given in the array.
Step 7 - Print the output.
The Chinese translation oflistofnumbers =[881234,954321, 7178952, 20033, 459, 20069] import math #define function def countDigits(thenumber): count=0 while thenumber != 0: thenumber //= 10 count += 1 return count #Use for loop for item in listofnumbers: c=countDigits(item) firstnum=math.floor(item/10**(c-1)) lastnum=item%10 total=firstnum+lastnum print("\nThe Given number is: " , item) print("The first digit is ", firstnum) print("The last digit is ", lastnum) print("The sum of first and the last digit is " , total)
Open the cmd window. Check the output in cmd window.
The Given number is: 881234 The first digit is 8 The last digit is 4 The sum of first and the last digit is 12 The Given number is: 954321 The first digit is 9 The last digit is 1 The sum of first and the last digit is 10 The Given number is: 7178952 The first digit is 7 The last digit is 2 The sum of first and the last digit is 9 The Given number is: 20033 The first digit is 2 The last digit is 3 The sum of first and the last digit is 5 The Given number is: 459 The first digit is 4 The last digit is 9 The sum of first and the last digit is 13 The Given number is: 20069 The first digit is 2 The last digit is 9 The sum of first and the last digit is 11
Example 2: Find the number of digits in a number by using the math.log10 function to find the sum of the first and last digits of an integer.
Step 1 - To count the number of digits in an integer, write the countDigits function.
Step 2 - Use the formula math.floor(math.log10(thenumber) 1) in this function.
Step 3 - Now divide the integer by 10**count to get the first number
Step 4 - Divide by 10 and get the remainder to get the last number.
Step 5 - To get the sum, add the first number and the last number.
Step 6 - Use an array with different integers to do this for numbers of different lengths.
Step 7 - Print the sum.
listofnumbers =[1234,54321, 678952, 200, 45, 10069] #Import the required module import math #define function def countDigits(thenumber): return math.floor(math.log10(thenumber) + 1) #Use for loop to iterate item for item in listofnumbers: c=countDigits(item) firstnum=math.floor(item/10**(c-1)) lastnum=item%10 total=firstnum+lastnum print("\nThe Given number is: " , item) print("The first digit is ", firstnum) print("The last digit is ", lastnum) print("The sum of first and the last digit is " , total)
Open the cmd window. Check the output in cmd window.
The Given number is: 1234 The first digit is 1 The last digit is 4 The sum of first and the last digit is 5 The Given number is: 54321 The first digit is 5 The last digit is 1 The sum of first and the last digit is 6 The Given number is: 678952 The first digit is 6 The last digit is 2 The sum of first and the last digit is 8 The Given number is: 200 The first digit is 2 The last digit is 0 The sum of first and the last digit is 2 The Given number is: 45 The first digit is 4 The last digit is 5 The sum of first and the last digit is 9 The Given number is: 10069 The first digit is 1 The last digit is 9 The sum of first and the last digit is 10
Step 1 - Write a countDigits function to count the number of digits in an integer.
Second step - Inside this function, for the count, first convert the int to str and then get its length.
Step 3 - Now divide the integer by 10**count to get the first number.
Step Four - Get the last number by dividing by ten and getting the remainder.
Step 5 - Now add the first and last number.
Step 6 - Execute this method for all numbers given in the array.
Step 7 - Print the sum.
listofnumbers =[11234,554321, 6789521, 2004, 3455, 60069] import math def countDigits(thenumber): snum=str(thenumber) l=len(snum) return l for item in listofnumbers: c=countDigits(item) firstnum=math.floor(item/10**(c-1)) lastnum=item%10 total=firstnum+lastnum print("\nThe Given number is: " , item) print("The first digit is ", firstnum) print("The last digit is ", lastnum) print("The sum of first and the last digit is " , total)
Open the cmd window. Check the output in cmd window.
The Given number is: 11234 The first digit is 1 The last digit is 4 The sum of first and the last digit is 5 The Given number is: 554321 The first digit is 5 The last digit is 1 The sum of first and the last digit is 6 The Given number is: 6789521 The first digit is 6 The last digit is 1 The sum of first and the last digit is 7 The Given number is: 2004 The first digit is 2 The last digit is 4 The sum of first and the last digit is 6 The Given number is: 3455 The first digit is 3 The last digit is 5 The sum of first and the last digit is 8 The Given number is: 60069 The first digit is 6 The last digit is 9 The sum of first and the last digit is 15
Figure 3: Output of Example 3 in the CMD window
Step 1 - First convert the integer to a string.
Step 2 - Get the first number using index 0 and convert it back to an integer.
Step 3 - Get the last digit using index -1 and convert it back to an integer.
Step 4 - Add the first and last numbers.
Step 5 - Do this for numbers of different lengths given in the array.
Step 6 - Print the calculated total.
listofnumbers =[12343,543210, 6789529, 9200, 45, 810069] #Use for loop for item in listofnumbers: snum=str(item) firstnum=int(snum[0]) lastnum=int(snum[-1]) total=firstnum+lastnum print("\nThe Given number is: " , item) print("The first digit is ", firstnum) print("The last digit is ", lastnum) print("The sum of first and the last digit is " , total)
Open the cmd window. Check the output in cmd window.
The Given number is: 12343 The first digit is 1 The last digit is 3 The sum of first and the last digit is 4 The Given number is: 543210 The first digit is 5 The last digit is 0 The sum of first and the last digit is 5 The Given number is: 6789529 The first digit is 6 The last digit is 9 The sum of first and the last digit is 15 The Given number is: 9200 The first digit is 9 The last digit is 0 The sum of first and the last digit is 9 The Given number is: 45 The first digit is 4 The last digit is 5 The sum of first and the last digit is 9 The Given number is: 810069 The first digit is 8 The last digit is 9 The sum of first and the last digit is 17
The numbers are specified and extracted from an array.
We have given here various methods to show how to add the first and last digits of an integer. Different integers of different lengths are written into an array. Then use different methods on these integers. The methods differ mainly in the method of finding the median of an integer or the method of finding the first and last numbers from it.
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