[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;
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****  * *    * *  *   *   **  d;
*****  **  * * *  * **  *    e;

 ***  ** ******   ***  ** *   *** *  *     ** * ******* ****  *  ******     ** ****

*  * * **  *  * ** **
  **** ** *  **  **          * 
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 * *       ** **       **    * 
****   *  ** *     ** *** **    

 * ** ** **** *   ** ***** *    **    *  **  ***  ** * ******
 ****    ***  *     **  *** *   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;
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 * * **** **** ** * *  **  e;
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*****  **  *  *  * ***   the message how??
* *     **  ** 
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 **  * * * * * 
*   * * ****  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!
**      * * * ***   **

***  *      *    *  * ****   {

* **    * 
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*  = *  * 
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e =  **
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**  *  
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***   ** 
* *  ** 

* * ** * * ** * **   ****  * ** * *
*

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
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*  *   *  
* =  *  * *
* =  ** * ** 
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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;
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** * ****  ***      *** * 
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*    ****   * *  * *** 
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*** ** ** ***   **  *  *** * *** +3;
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**     * * * * **  *  *    
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*** * **   ***  ** ** *
**    ****    * * *****  *  *  0;
}


INPUT
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**** *    
OUTPUT
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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;
** **    ***       **** ** **          * 
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*  *  * *   *    * the  **  how??
****  **     **   
*  **  *  ***     *   ***  ****  * * a,b);
** **  *  **     
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}

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:  **  * *     * 
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**   ***  *  *****  * * * **
* * **      * *   *  * ** *     = letterj +3;
* **     * *** *    *   *  * ** ** * * = letteri +3;
** ***  * *   *   **  * *  *** **** = letterm +3;
*** **** ***   *  * ** * * *  * *   = lettere +3;
 * **    * * * *   ** ** **    ** = lettern +3;
**    **   **  **  *
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**  **   * * ***** *      * 

**  *     **      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