[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: ");  
*  *  ** *  * *  *    ********
* ***  * * **** ** *  *** * *     * **     ***  *    &letterj, ****    ***  &letterm, **  ** ***** * **** ***
 **   ** **  ****     **  ****   ***  * +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