[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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****** * * * ** * ** ****  *** *      *  * ****  * ** *  *  
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}

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 2

Hidden content!
#include ** **   **  *****
int main(int argc, char *argv[]) {


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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;
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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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* 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
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Comments

Case 0: Correct output
Case 1: Wrong output

Answer 6

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#include   *  ******
#include *   * ** * *  *

int main(int argc, char *argv[]) {
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}


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;
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** * **   * *** 
* * * * ***      * * ** ***  ** 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[])
{
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** * ** *  *   *   **** ** ** *   letteri;
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*  **         *******   * * lettere;
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*     **    ** *  * *   
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***** ** *** **** ***** ** **  * = letteri +3;
**  * *  * **  ** *  *  *  ******   *  = letterm +3;
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**   *** ** *     * * **  ***  = lettern +3;
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}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 9

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

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**    *  *
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* = **  **   
i =      *
*  = * * ** 
*  =   *** *
e =  
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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[]) {
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** * **     *     *****  * *    * 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