[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 =    
 * = *   
  = *  
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* **    
*** ** *
**  **
  *  * 
*** *  * *

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

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