[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!
 ** *** **  ** ** 

     **   * *  **  **   {

 ***  *** ** 
  = *** * * 
  = *******
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e =   *
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  = * *
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*  ****
* ****  
*   * ***
*** ** *  
*  *  * 

**  ** *  ***   *** *   *  ***  **   
*

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;
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 * *   **     * * *****        
* **  * *** **      *  **  **  **    *  input the letter to encode: ");  
*   ** ***  *   * ** *  *  **
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    * *   * ***** *    * *****   *** +3;
* * * **  ***  ****  * *  *   *    +3;
  *    *    * *** * ** *** ** **     *** +3;
  *  *** ***  *    *** **   * * * **  * +3;
 *  *  ***   ****  *   ***    *   *  +3;
 * ** ***** ****  *   * ** 
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*  **  ****  **** ** ****  *****   ** ** *  **  ** * *   * *   *  ** * 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