[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