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Examples:
Input : 12345
Output : First digit: 1
last digit : 5
Input : 98562
Output : First digit: 9
last digit : 2Bàn luậnmodulo operator %. When modulo divided by 10 returns its last digit.
Suppose if n = 1234
then last Digit = n % 10 => 4
To find first digit of a number is little expensive than last digit. To find first digit of a number we divide the given number by 10 until number is greater than 10. At the end we are left with the first digit.
Cho một số để tìm chữ số đầu tiên và cuối cùng của một số.examples: & nbsp; & nbsp;
C++
Để tìm chữ số cuối cùng của một số, chúng tôi sử dụng toán tử modulo %. Khi modulo chia cho 10 trả về chữ số cuối cùng của nó. Để tìm chữ số đầu tiên của một số, chúng tôi chia số đã cho 10 cho đến khi số lớn hơn 10. Ở cuối, chúng tôi còn lại với chữ số đầu tiên. & NBSP;
Cách tiếp cận 1 (với vòng lặp):
#include <bits/stdc++.h>
{
using namespace std;
#include <bits/stdc++.h>3#include <bits/stdc++.h>4
int firstDigit(int n)
#include <bits/stdc++.h>8
#include <bits/stdc++.h>0____11 #include <bits/stdc++.h>2
{
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 #include <bits/stdc++.h>7
#include <bits/stdc++.h>8
int using0int n)
{
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 using6
#include <bits/stdc++.h>0namespace5namespace6
#include <bits/stdc++.h>3namespace8
int using9
#include <bits/stdc++.h>8
#include <bits/stdc++.h>0int namespace3
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 std;1
Java
std;3 std;4
std;3 std;6
#include <bits/stdc++.h>0{
std;7 std;8 std;9
firstDigit(4firstDigit(5firstDigit(2firstDigit(7
#include <bits/stdc++.h>0std;7 int2 int firstDigit(int n)
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>3#include <bits/stdc++.h>1 firstDigit(1firstDigit(2firstDigit(3
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 #include <bits/stdc++.h>7
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>0std;7 int2 int using0int n)
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 n)4firstDigit(2n)6
#include <bits/stdc++.h>3#include <bits/stdc++.h>02namespace6
#include <bits/stdc++.h>3#include <bits/stdc++.h>05
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>8
Python3
#include <bits/stdc++.h>0std;7 int2 {2 {3
#include <bits/stdc++.h>3int {8{9firstDigit(7
#include <bits/stdc++.h>09 #include <bits/stdc++.h>10
____10#include <bits/stdc++.h>1 #include <bits/stdc++.h>13#include <bits/stdc++.h>14 firstDigit(2#include <bits/stdc++.h>16
#include <bits/stdc++.h>3#include <bits/stdc++.h>18#include <bits/stdc++.h>14 #include <bits/stdc++.h>18#include <bits/stdc++.h>21 firstDigit(2firstDigit(7
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 int#include <bits/stdc++.h>27
#include <bits/stdc++.h>09 #include <bits/stdc++.h>29
____10#include <bits/stdc++.h>6 #include <bits/stdc++.h>32#include <bits/stdc++.h>33 firstDigit(2firstDigit(3
#include <bits/stdc++.h>40#include <bits/stdc++.h>46
C#
#include <bits/stdc++.h>18#include <bits/stdc++.h>14 {9firstDigit(7
std;3 std;4
std;3 std;6
#include <bits/stdc++.h>0{
std;7 std;8 std;9
firstDigit(4#include <bits/stdc++.h>4
#include <bits/stdc++.h>0std;7 int2 int firstDigit(int n)
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>3#include <bits/stdc++.h>1 firstDigit(1firstDigit(2firstDigit(3
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 #include <bits/stdc++.h>7
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>0std;7 int2 int using0int n)
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 n)4firstDigit(2n)6
#include <bits/stdc++.h>3#include <bits/stdc++.h>96namespace6
#include <bits/stdc++.h>3#include <bits/stdc++.h>05
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>8
#include <bits/stdc++.h>0std;7 int2 {2 {3
using03
#include <bits/stdc++.h>3int {8{9firstDigit(7
{
#include <bits/stdc++.h>09 #include <bits/stdc++.h>10
____10#include <bits/stdc++.h>1 #include <bits/stdc++.h>13#include <bits/stdc++.h>14 firstDigit(2#include <bits/stdc++.h>16
#include <bits/stdc++.h>3#include <bits/stdc++.h>18#include <bits/stdc++.h>14 #include <bits/stdc++.h>18#include <bits/stdc++.h>21 firstDigit(2firstDigit(7
#include <bits/stdc++.h>8
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 int#include <bits/stdc++.h>27
{
#include <bits/stdc++.h>09 #include <bits/stdc++.h>29
#include <bits/stdc++.h>8
____10#include <bits/stdc++.h>6 #include <bits/stdc++.h>32#include <bits/stdc++.h>33 firstDigit(2firstDigit(3
#include <bits/stdc++.h>18#include <bits/stdc++.h>14 {9firstDigit(7
using42using0using06using39using46firstDigit(7
#include <bits/stdc++.h>40#include <bits/stdc++.h>41#include <bits/stdc++.h>14 namespace6firstDigit(3
using48
using #include <bits/stdc++.h>48
#include <bits/stdc++.h>0{
std;7 std;8 std;9
#include <bits/stdc++.h>0std;7 int2 int firstDigit(int n)
#include <bits/stdc++.h>3#include <bits/stdc++.h>1 firstDigit(1firstDigit(2firstDigit(3
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 #include <bits/stdc++.h>7
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>0std;7 int2 int using0int n)
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
using74using75
#include <bits/stdc++.h>3using77namespace6
#include <bits/stdc++.h>3#include <bits/stdc++.h>05
using81
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 n)4firstDigit(2n)6 O(log10n)
Auxiliary Space: O(1)
#include <bits/stdc++.h>0std;7 int2 {2 {3
C++
#include <bits/stdc++.h>
Cách tiếp cận 1 (với vòng lặp):
#include <bits/stdc++.h>
{
using namespace std;
#include <bits/stdc++.h>0using99intnamespace01namespace02namespace03
int firstDigit(int n)
#include <bits/stdc++.h>8
#include <bits/stdc++.h>0____11 #include <bits/stdc++.h>2
{
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 #include <bits/stdc++.h>7
#include <bits/stdc++.h>8
int using0int n)
{
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 using6
#include <bits/stdc++.h>0namespace5namespace6
using74namespace8
int using9
#include <bits/stdc++.h>8
#include <bits/stdc++.h>0int namespace3
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 std;1
Java
std;3 std;4
#include <bits/stdc++.h>0{
std;3 std;6
#include <bits/stdc++.h>3using99intnamespace52intnamespace54firstDigit(2namespace56
#include <bits/stdc++.h>0std;7 int2 int firstDigit(int n)
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>3#include <bits/stdc++.h>1 firstDigit(1firstDigit(2firstDigit(3
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 n)4firstDigit(2n)6
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>0std;7 int2 {2 namespace81
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3int {8{9firstDigit(7
#include <bits/stdc++.h>3namespace90
namespace91namespace6 #include <bits/stdc++.h>05
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>8
Python3
std;3 namespace98
#include <bits/stdc++.h>09 #include <bits/stdc++.h>10
Các
Các
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 #include <bits/stdc++.h>7
#include <bits/stdc++.h>09 #include <bits/stdc++.h>29
____10#include <bits/stdc++.h>6 #include <bits/stdc++.h>32#include <bits/stdc++.h>33 firstDigit(2firstDigit(3
#include <bits/stdc++.h>18#include <bits/stdc++.h>14 {9firstDigit(7
#include <bits/stdc++.h>40#include <bits/stdc++.h>41#include <bits/stdc++.h>14 namespace6firstDigit(3
#include <bits/stdc++.h>40#include <bits/stdc++.h>46
C#
using #include <bits/stdc++.h>48
std;8 namespace35
#include <bits/stdc++.h>0int2 int firstDigit(int n)
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3int using93intstd;56
#include <bits/stdc++.h>3using99intnamespace52intstd;62
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 #include <bits/stdc++.h>7
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>0int2 int using0int n)
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3#include <bits/stdc++.h>6 using6
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
____10std;7 int2 {2 #include <bits/stdc++.h>89
#include <bits/stdc++.h>0{
#include <bits/stdc++.h>3int namespace3
#include <bits/stdc++.h>3std;92
std;93namespace6 #include <bits/stdc++.h>05
#include <bits/stdc++.h>0#include <bits/stdc++.h>8
#include <bits/stdc++.h>8
PHP
using03
using04 firstDigit(using06firstDigit(3
{
#include <bits/stdc++.h>0int06 int07using06n)6
Các
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 using06firstDigit(7
#include <bits/stdc++.h>8
using04 using0using06firstDigit(3
{
____10#include <bits/stdc++.h>6 using11using06 using32
#include <bits/stdc++.h>8
using06 using35
using36 firstDigit(using06int38namespace6int40
using42using0using06int44using46firstDigit(7
int47
JavaScript
using48
using04 using51
{
#include <bits/stdc++.h>0int53
#include <bits/stdc++.h>0int55
#include <bits/stdc++.h>0#include <bits/stdc++.h>6 #include <bits/stdc++.h>7
#include <bits/stdc++.h>8
#include <bits/stdc++.h>09 #include <bits/stdc++.h>29
____10#include <bits/stdc++.h>6 #include <bits/stdc++.h>32#include <bits/stdc++.h>33 firstDigit(2firstDigit(3
#include <bits/stdc++.h>8
using75
int67namespace6firstDigit(3
int70int71firstDigit(3
using81
#include <bits/stdc++.h>18#include <bits/stdc++.h>14 {9firstDigit(7O(1)
Auxiliary Space: O(1)
#include <bits/stdc++.h>40#include <bits/stdc++.h>41#include <bits/stdc++.h>14 namespace6firstDigit(3log10() is a mathematical function present in math.h header
file. It returns log base 10 value of the passed parameter to log10() function.
print ("Nhập một số:", end = "") thử: num = int (input ()) đếm = 0 trong khi num! = 0: if Count == 0: last = num % 10 đếm = đếm + 1 rem = num % 10 num = int (num / 10) in ("\ nfirst Digit (", rem, ") + chữ số cuối cùng (", cuối cùng Đầu vào!")num = int(input()) count = 0 while num != 0: if count == 0: last = num % 10 count = count + 1 rem = num % 10 num = int(num / 10) print("\nFirst Digit (", rem, ") + Last Digit (", last, ") =", rem + last) except ValueError: print("\nInvalid Input!")
