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!
** *  ** ** * * **
 *  ***  
{
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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