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()
{
**  *  * *** **    **** * **** * * *** x;
 * * ** * **  *  *  ** ** ** *  *  ***  * *  
 **    **** *    ***   ** ***   **   *   * *  **  ** ***  ***   *     * ** **            
*       *  * *   * **   *** *  ** *  ** *  *   *  * ***** **   ** ***  *** ***** *
 *  * **** **   ** *    * * **    ***  ***  * **  * *****    * *   *** **  *** *   *    ** * * * *   *         
********** *   * **   * *****    **  *   **  **  
**   *   *  ** **     ***  ***  ****   **   ****** * * * *  ** *       **   **  ;
**** ***  *** *  **** *** ** *  
*  * *   * **  * *  *   * * **    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;
* * *  ** **  *  **     ***       **  ***  *  
**    *  ***** * *  * *** *****      ** ***   **  *   *  * **   *  **  **        *** ** **             
 * * * * * * **    *** *  * *  *** **      * ** ** *  ****  ***  * ** * *  
* * *  *  ****    *  **    **    ** *  *** *  **    ** ***  ****  *** *  ** ***  *  ** ****  * **     * ***       
 **  *       * ** *** ****   **  * *** ** ** *     * 
 *  * *****   **   *  **  *** *** **  * *** **  *   * ** * ** ** *   * ** * **  **  ;
* ** * *****  **      ** 
 ** * * **** *      * ** **     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