[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