[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;
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*      *  * *  ****   ***  *** 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: ");  
  * *  * *  ** * **** * *   * 
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 * **      *  ***   ***  ** * **   *   * +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