[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