[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