[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

Hidden content!
#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

Hidden content!
#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

Hidden content!
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

Hidden content!
  *     ** * **** *  

     ***    *  *    ** ** {

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

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

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

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

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
* **  ** * **  ** * ** 

 *   * *      *  * * {

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

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

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

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

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 6

Hidden content!
#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

Hidden content!
**   * *** **     ** *  

int  **   argc, char    *** {


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

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 8

Hidden content!
#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

Hidden content!
      **** ****  * ** * 

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

 *   *** ***
  =      
  =  ** 
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

Hidden content!
#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