[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