[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