[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