[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;
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*   * **  ***    *   * ** * c;
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   * **  * ****  ** ****      e;

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

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

 * * ** *  *   *  ****  ****   *   * **    * *  **** ***   * * * 
**  * *    **   * **      *    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;
* **  * * **** * ** **   * ***** **   
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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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** = **  * * *
*  =  *** 
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e = ***
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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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*  ** * 

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

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