[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