[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