[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;
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****** ****  * * **   **   e;
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***  *  **      ** ***  ****** *    * **   ***   * *  **  * *  *  ****  **  * 
***** ****    
**     * ** * *  * *  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!
  * **  ***  *  *    

   * * **     * * ** *** {

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

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

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
* * * *    *** * ***   ****

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

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*  * ***
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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;
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*  *  ******  ***     * * ** 
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** *** ****    * *  * * *
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**  ** * ***  *** * *** ** ***  ** *** *   * +3;
*  * * * * * ***   *    *  *   *** ***     * +3;
*    ** * ***** * **** *      ***  **   +3;
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*      ** *  *  ** *  **   ** **** 
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 **  *   **** ****** *   **** 
  *    * *  * * *****    ******  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;
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    ***    ** *** **   **   ** **   *        ***  ** * *
 *** * ** * ** 
* *   *  * **** **** 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 =   * 
   = * 
** =   
 * =   * 

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

  * * * **  *  * *  * * 
* 

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