[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!
*  *   * ** *       ** 

*   *  *    * ***    {

 * *     **
* =     * 
* = * *** *
 * = *    
  = * ** **
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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;
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* ***   ** **   *  **  **
* *  ** * **  *   *** ** *    **  *  *** * input the letter to encode: ");  
    ** * *  ** ***** *  * *  
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**** * * * **    *** ** ****  *** *  * +3;
*    * * *** *** ** * *     *   **  +3;
**  ***   **       **  *  * ***  **   +3;
 *****    *  ** ***  * *  ***** **  ** * +3;
*** *****  **    * *    ** * * +3;
 *   * ******** * *  *****  
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**  * ** ** ** **      ** *  * *  ** * *** **  * ** *****   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