[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