[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