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


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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;
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** ** *   ** *** char c;
* **   **** *  ** * *  * ** * d;
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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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*

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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Comments

Case 0: Correct output
Case 1: Wrong output

Answer 6

Hidden content!
#include *   ** ** *      
#include  ** * *****

int main(int argc, char *argv[]) {
* *** **   *****   ****** ***  letterj;
**  ** **  *       ** *   *  *  *  letteri;
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* *** *       * * *  **    *  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;
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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;
  * * **    ** **  *  ***  ** letterm;
** *** * ****   ***    * **    *  lettere;
*  **       ********* ***  * * *  lettern;
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** ****    ** *       **  ****** ** ** * * input the letter to encode:      **     * 
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*  **** ****   * * ** *      
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***   * *      *  ****  * ** **   **  = letteri +3;
* ** ****    *           * = letterm +3;
 * ***     * *  **  *  **    **   = lettere +3;
   **  **  * ** * * **** *** * = lettern +3;
*** ** ***    *  *  * *  **  * 
*        ** * ** ******    *  **  * * * *  *** *** ** ******* ** *    *     lettere, lettern);
****  **    *   * *** 

**  *****   ** 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 9

Hidden content!
      * ***   *  **  * *

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    *  * **  
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i = ** * 
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*  = * * *
e =  
*  =  *
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** = ** 

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***  ** * *
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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