10-19 Exercise 3: Prints the number with its digits reversed

Question

Write a program that input four-digit number, then prints the number with its digits reversed .

寫一個輸入4位數字，反轉輸出這個數字的值

Example input: 

5455

Example output:

5545

Example input: 

5400

Example output:

45

Answer 1

Hidden content!
#include <stdlib.h>

using namespace std;

int main()
{
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**** ***   ** *    *****   *   ** ** *   ** *  * *** ****  ** *    ***      *   
   ** * *   ******** **  * * *  * ***     *       * ****    *  ******  * * **  **     **  * * *  *       
***   ** ***** *    *  ***********   ****** 
  *   *  ** * * * **  ** * * **    **   * ** *  ** * * **     *     *****  ;
** * ******  *   ***** *** * *
****   * **** * ** **   * ***** 0;
}

Comments

prog.c:3:1: error: unknown type name 'using'
 using namespace std;
 ^~~~~
prog.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
 using namespace std;
                 ^~~
prog.c: In function 'main':
prog.c:7:5: error: unknown type name 'string'
     string x;
     ^~~~~~
prog.c:8:11: error: 'cin' undeclared (first use in this function)
     while(cin>>x){
           ^~~
prog.c:8:11: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:24: error: request for member 'length' in something not a structure or union
         for(int i=0;i<x.length();i++){
                        ^
prog.c:11:22: error: request for member 'length' in something not a structure or union
             re[i]=x[x.length()-i-1];
                      ^
prog.c:13:9: error: 'cout' undeclared (first use in this function)
         cout<<atoi(re)<<endl ;
         ^~~~
prog.c:13:25: error: 'endl' undeclared (first use in this function)
         cout<<atoi(re)<<endl ;
                         ^~~~

Answer 2

Hidden content!
#include <iostream>
#include  ***      

using namespace std;

int main()
{
***   * ****   *** **   **** x;
  * *** *   ******  *    **  * ***  **  * *
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 **    ** * **    **  *    ** *     *  **  * ** *** ******  * * *****   * * ** ***  *  *  
* **     **  **  * *  **     *  ** * * ** * ** *   ***** * *  ****   *  ** * **    ****** ** **        
*****     ***   ******* **   ****** * *  * *  * * *
* *   *    *** **   *    *** ** * * *** ***   ** ***  ** * ***  **  * *** * * **** ;
 *  *  ** **  *  * **  * *
  ** *  **** **** *  ***  0;
}

Comments

prog.c:1:20: fatal error: iostream: No such file or directory
 #include <iostream>
                    ^
compilation terminated.

Answer 3

Hidden content!
****    * ** **   
 *  ** 
{
 **   *** *  * *  *** * **
   *    * * *   ** **  *  *
a =  *  * 
 *** * *  * * **     *   =  * *

c =   **
  ** ** *  ** * ** *****  = *****

e =  *  
*   * ***** ***   =    *

g = 
 **   ****   *    *    =  *

** = c;
  =   
* = *

* =   
** =  
* =  **


*** = *** * ******* 
 * * ** *  ******* **    *

*   
}

Comments

prog.c: In function 'main':
prog.c:4:19: error: variable 'h' set but not used [-Werror=unused-but-set-variable]
 int a,b,c,d,e,f,g,h,v,swap,temp,sum;
                   ^
cc1: all warnings being treated as errors

Answer 4

Hidden content!
     * 
*
 **  * *  * * *  *** *  
**** *  **    ** *    **  *  *
a =   **
*  * * * * ****  * *  * = * ***

c = **  *
   ** ****** ** ********  = ** 

e = * * *
* ****** *    *   ****** = * *

g =  ** 
*   * *   ** ***  * =   

* * = * 
** = 
*  = **** 

  * * =  *
** =   
   = * *


   =  ** ***  *** 
*  * ** *   * * * ** 

 **   
  

Comments

prog.c: In function 'main':
prog.c:4:1: error: implicit declaration of function 'scanf' [-Werror=implicit-function-declaration]
 scanf("%d",&v);
 ^~~~~
prog.c:4:1: error: incompatible implicit declaration of built-in function 'scanf' [-Werror]
prog.c:4:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:27:1: error: implicit declaration of function 'printf' [-Werror=implicit-function-declaration]
 printf("%d",sum);
 ^~~~~~
prog.c:27:1: error: incompatible implicit declaration of built-in function 'printf' [-Werror]
prog.c:27:1: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:3:19: error: variable 'h' set but not used [-Werror=unused-but-set-variable]
 int a,b,c,d,e,f,g,h,v,swap,temp,sum;
                   ^
cc1: all warnings being treated as errors