[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