[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;

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   * ** **  *  *  ** *** *   ** * 
*   ***** ***  ****      *****  ****
 **  *  * ** **  *         *   **   
 *  *    **  * ****  * **  * * *
 *  **  ***     * ** * ** *** 

 * **   ***** **  ** *   *** *   *     *  *  * **  *  * ****
* ***  *  **    *    *****   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!
  **  * *    *    * ***

     ** * **   ** **   {

*  **  * 
** =  *** *
 * =    *** 
** =  *  * 
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   =  ** *  * 

e = **  
* =   *
  =   *
   =  * 

 ***   * 
*****  *  
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**** **      * * *  *  * ** ** ***  

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;
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  *  ***** *     * ***** **
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***    ***   *  ** * * **      *
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 *  * * * * * ******* *  *  * ** ** ** +3;
 *****   ***   * ** **    *  * *   +3;
****  ** ** *  *    * * **  ******  +3;
 **   *   * *** ******  **** *   * +3;
*    * ** *   *     * ** 
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   * * * **   **  * *  ****    *     *    * *   **** ** * *   **  * 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