[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