[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: ");  
*  * * ***        ** **** 
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** *    * ** * * ***    **      * +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