[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