[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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 * = *  

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

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

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