[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