[Exercise 03] Caesar Cipher Decoder

Question

You have received an encrypted message from Julius Caesar-- the message is ebiil.  You are asked to decipher the message in order to understand what Caesar trying to say to you.

Hint

Luckily, Caesar has given you a hint, he says: 'I, myself, encoded the message by shifting every word backwards by 3.' 

Solution

Write a program that receives 5 characters 'ebiil'. Then decode those characters into 5 new characters.

Example

#include <stdio.h>

int main(int argc, char *argv[]) {


	char a;
    	char b;
	 	
	scanf("%c%c", &a, &b);
	
	//decode the message how??
	
	printf("%c%c", a,b);
	
	return 0;
}

Input

ebiil

 

 

 

 

 

 

 

 

 

 

Output

hello

** REMEMBER ** 
This is an online-compiler, don't put anything except the codes. If you want to make a comment, please use // or /* */

Answer 1

內容已隱藏
#include<stdio.h>

int main (int argc,char *argv)
{
    char a;
 * ***   ****  * * * * b;
***  *   * * *    *     * * ** ***  c;
   *  ***** * **** *****   *      d;
* ******    * * *** * *** e;

***          * *** **  ***    ** **    ***** * **  ****** **  *  *   **  ** * * 

**  * ****** *  *  *****   
   ** *** *     * * * ** ** 
* ** * *** ****    ******    *
 *    **** *** * **  * * *** * **  
     *   **  *  *    *  *    *

* *     * ** * **   ***  **      *  * ** * * * ***   ***   *
   ****      *   ** *** *** ** *   0;
}

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 2

內容已隱藏
#include *** *  *    **** **
int main(int argc, char *argv[]) {


* *  **    * ** char a;
  *  *     *** ***  ** ** b;
   * * ** ** *    ***** ** c;
*** * * * *   ** *     * **   d;
**  ***  ****  **** *  ** *     e;
 **      *  **    ** * * ***    ** * 
* *  *  *  * * *    ** *  ***        **  *  **    * *****     * * *        * 
*** *  *  * 
* *     * * * *     the message how??
* ***  * * *  *  
  *    ** * * **         ** *********  ** *  *   ***
   *    *  ** ** * 
** **  **   * *   return 0;
}

Comments

prog.c: In function 'main':
prog.c:10:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%c%c%c%c%c", &a, &b, &c, &d, &e);
  ^~~~~
prog.c:10:2: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:14:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("%c%c%c%c%c", a+3,b+3,c+3,d+3,e+3);
  ^~~~~~
prog.c:14:2: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:14:2: note: include '<stdio.h>' or provide a declaration of 'printf'

---

Case 0: Correct output
Case 1: Wrong output

Answer 3

內容已隱藏
int main(int argc, char *argv[]) {


* **  *   char a;
 **  ** * * *  **  ***  *   b;
     *  *        char c;
* **** ** ** * * **  **    *   d;
*   ***  *    *** * ** *  e;
*** *  ** ** *   * **    **   *** **  ** ***  *   
     *   ****** %c %c %c %c **  ** ** *** **  *  * ** * *  * *  *  *     ** *  * *     
 **** *   
    *    ** ** ****** ** **   ** ***  * **   *    ** * *   * ****  * *  **  ***   *  **
 * *** **** ****  *  *  * 
*  ****    ***   *  *   **
*   ********** *** *****   *
**   *   * **      *    *  *
  ******* **  **   *   **  *
 ******* * ***** *     ** *** **   ******* *  
*  *   * * * * **   *** * *   ** 
* **** ** **  *   0;
}

Comments

prog.c: In function 'main':
prog.c:10:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%c %c %c %c %c %c", &a, &b,&c, &d,&e);
  ^~~~~
prog.c:10:2: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:10:25: warning: format '%c' expects a matching 'char *' argument [-Wformat=]
  scanf("%c %c %c %c %c %c", &a, &b,&c, &d,&e);
                         ^
prog.c:12:6: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
      ^
prog.c:12:12: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
            ^
prog.c:12:18: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                  ^
prog.c:12:24: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                        ^
prog.c:12:30: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                              ^
prog.c:14:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("hello");
  ^~~~~~
prog.c:14:2: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:14:2: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:18:5: warning: incompatible implicit declaration of built-in function 'printf'
     printf("errol");
     ^~~~~~
prog.c:18:5: note: include '<stdio.h>' or provide a declaration of 'printf'

Answer 4

內容已隱藏
****  *  *  *** * *** * 

*   *  * **  *      * ** {

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

e =  * *
  =    
* =    
* = *  

 ****
** * * *  
 *** ** 
** ******
** *   

 *  ** ** ** *** **  ***  * ***   
 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

內容已隱藏
   * *  *  ** * ** *** 

      *   * *   *   ** * {

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

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

*  * * *
***  *
**  ****  
   *  ** 
****** **

     **    * ** *** * ***     *
* 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 6

內容已隱藏
#include **   *     ** *
#include ***  * **  **

int main(int argc, char *argv[]) {
 ***  *   **   ** *  *  * ***  * letterj;
* **** * **** * **    letteri;
    *    * **  *   * *       letterm;
* *     ***** **  **    ***** lettere;
*    * *   * ****     * *  lettern;
     *   *** * * *  * *   * 
*  ***  * ** * *** *  **    *****  ***    * input the letter to encode: ");  
**   *** **    *    * **
** *******  *     ** ** **   * **  **** ***** *  &letterj,      **** &letterm, * *********  * * *  *  **
 ***  *  ***** ** **** *  *   *  *  *** +3;
**  *   ** * **              * * *   *   +3;
  * **    **  * *** *****   * ***** +3;
**    ****    ***  ** **  **  ****    *  *  +3;
****  *  * *** **     ***** ***  * *  +3;
   **** *  ** *   ** *   *    
  *   ** *    *** ******  
 **   ****   **  ****   * *** **  *  ** * **      **  * *******   **  lettere, lettern);
 ******   *  ** **    ** *** 
 *    * *  * ** * ***  * ******  *** 0;
}


INPUT
   * * * ** * **  
* **  ***   ***
OUTPUT
 **    ** *** ** * *   

Comments

prog.c:27:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:30:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:30:1: error: unknown type name 'OUTPUT'

Answer 7

內容已隱藏
*   **  * ** ** *   

int   *** argc, char *   {


 *** * *   ** * char a;
 *** *   *  **  *  **  *    *** **   **       ** char b;
*     *   **  ****  **** ** * ** *   * ******* 
*    *   **       ** * ********  *  *   *** ***    ** 
  * **  * ***   
***  * *** *     *  the *** * how??
* **    ****  * 
   * *  ** **** ** *** **** * **  a,b);
 **   **  ** ** 
  *****   *  * * *  * * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 8

內容已隱藏
#include **  **** * **

int main(int argc, char *argv[])
{
*** ** * *  ** * letterj;
***   **   * * *   * *   * letteri;
 ** * ** *****  ** ** *   **  letterm;
*    *****   *** *****  *  * * *  lettere;
 *    *   ** *** * *** ***** * * *   lettern;
* ***  ***  *   * * ******** *** 
**    * *  ****   *  * *  ***     * *** input the letter to encode: ****  * ** ***** 
*    *  ****   **** * *  *  *   * *** *    ** ** ** **     ******** * **** *   *   *  ***     ***   *  ** * *** * 
  **  * * *   **  *   * *
**           *  * *****   **  *  **** = letterj +3;
 ** * * * ******** * * *   * * ** = letteri +3;
* ** ******  *   * * ****** **** = letterm +3;
  **** ***  **  * *     *   *  ** ** = lettere +3;
 * * ** ** ***   ***     ** * = lettern +3;
  **  *  ** *  *   ** **   * *
   * *  *  * **     *    * * ******  * *   * ****  **     *** *  lettere, lettern);
* ** * * **    * *  *   *  *

* *** ** *   **   0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 9

內容已隱藏
**    * ** *   ** * *  

     * **  *   *   ****** {

** * **  
* =  *   
* = *** **  
i =   * * *
  = *   *  *
   = *     
e = *  
*  = * * 
* = * * 
  = * * 

   *****
****** **
 * *  ***
 **   ***
   *  *

  * * *     * *  *   * ***** 

Comments

prog.c:1:16: fatal error: stdio: No such file or directory
 #include<stdio>
                ^
compilation terminated.

---

prog.c: In function 'main':
prog.c:6:5: error: 'cin' undeclared (first use in this function)
     cin >> a;
     ^~~
prog.c:6:5: note: each undeclared identifier is reported only once for each function it appears in
prog.c:11:5: error: 'cout' undeclared (first use in this function)
     cout << a << endl << endl;
     ^~~~
prog.c:11:18: error: 'endl' undeclared (first use in this function)
     cout << a << endl << endl;
                  ^~~~

---

prog.c: In function 'main':
prog.c:6:11: warning: too many arguments for format [-Wformat-extra-args]
     scanf("c", &a);
           ^~~
prog.c:11:14: warning: format '%c' expects argument of type 'int', but argument 2 has type 'char *' [-Wformat=]
     printf("%c", a)
              ^
prog.c:12:5: error: expected ';' before 'return'
     return 0;
     ^~~~~~

---

prog.c: In function 'main':
prog.c:6:11: warning: too many arguments for format [-Wformat-extra-args]
     scanf("c", &a);
           ^~~
prog.c:11:14: warning: format '%c' expects argument of type 'int', but argument 2 has type 'char (*)[5]' [-Wformat=]
     printf("%c", &a);
              ^

---

Case 0: Correct output
Case 1: Wrong output

Answer 10

內容已隱藏
#include    ** * *  * *
#include * ** **** ** * * 

int main(int argc, char *argv[]) {
 **  *     *   ** * *   *      letterj;
****** *  * ** *** * ** **  **** letteri;
* *****  *****   *** * **** ** letterm;
****  ***  * * ******* *  *****   lettere;
  ******* *  * *    ****  ** * lettern;
*      * * ** *** *  *  ** 
**        *         ***  * *   **   * * input the letter to encode:  *  * * *    
   * **  ** *** * *** *  *   *  **** **  **** * *** * *   * * *  **  *  *****  ** **    *  ***  *  **  **  ***  **   *   **       *  *  
**  * *       ****** ** *
**       ** ** ***** letterj = letterj +3;
*  ****** *  **** *** ** * * ** *  = letteri +3;
* **   ** *  * ****   * ** *** * = letterm +3;
  ** * * *  * * *    * **  ***  = lettere +3;
* *     *  ******  *** ***     = lettern +3;
**    **  *   *** * *  *  ***
  * **  **        * *****   *  **  * **  *****   ** * * ***   * * * * *  ** * lettere, lettern);
** ** *    **  **  ***
*  ****    **   ** *** *  **    0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output