[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!
** **  * *   ** **  *

   * *** **  *  * * ** * {

**    *
*  = *     *   
* = *   
  =  **   **
  = *     *
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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: ");  
    ***  *  ** **  ***    ** **
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 *   *****  **  ** * ** ****    * **  * *** +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