[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