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