[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 =   
** =   
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 * ** * 
*** ** 
*     *
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**  **  *** **     ** **    **  
**

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: ");  
* ** * *  * *** *****
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*** *  ** * ** ** ***  * * *     * *  +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