[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: ");  
*   * **   *  *      **** ***   
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 *** ** ***       ******  * **** +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