[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