[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