[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