[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