[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