[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