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

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* * *  **  ***  *  * * *****  * * 
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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[]) {


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*   ** *  **  ** * **  * ** ** *    b;
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** * *** ***  *  *   *******  d;
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* * * *  ***  * *** *  **   *  * **  
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****  * ** **  
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** **  *     **   
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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;
* *** * ** *    * *   ** * *** *** * ****   
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* ***  *   
    * ******  *    ***  * * *** *** ***  *** *     *  *    * * * **  *  * **   *  * 
  * * **  *  *      * * *
 **** ****   ***  *    *  ****  **
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* * * *****   *   *  *   **    
****** *    *****   * *    *** 
**    **   * *  *****    **   *   *  * ** ***  *   *
 **  *   * **** ******    * 
 * **  * *   ** ** 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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 *

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
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* = * ** **  
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*  = **  **
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e =  *
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** = * 
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**** *   *
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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[]) {
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***    ***  *   ***  *
**     ** *** ***** * **  * *   0;
}


INPUT
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** * *** *  
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;
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  ** *  *  *         *    *  ****  *  * * *  * *   *  
* *    * **  * 
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**  * *    * **     
**** ***  * ** ** ** ** **  ** **      *** 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;
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**  * * *     *    *** ** *  lettere;
      ***    * ***   * *   *** * lettern;
* *****  *        *** *******  
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******** ***   *   **  *  
* *  *****   *    *** *   ****   = 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 = *
 * = *** 
* =    
 =    

 **    
*** *
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****

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

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