#include <iostream> #include <string> #include <stdlib.h> using namespace std; i

Question

#include <iostream>
#include <string>
#include <stdlib.h>

using namespace std;

int main()
{
char message[100];
char output[100];
int key, count;

cout<<"Enter encrypted message:";
cin.getline(message,100);

for(key=1; key<=100; key++)
{
for(count=0; message[count]!=''; count++)
{
if(message[count]-key<32)
output[count]=message[count]-key-32+127;
else
output[count]=message[count]-key;
}
cout<<"Dencrypted message using key"<<key<<":";
cout<<output<<endl;

}
return 0;
}

Explanation / Answer

/*Provided comments for each of the line please check*/

#include <iostream.h>

#include <iostream>
#include <string>
#include <stdlib.h>

using namespace std;

int main()
{
   //declaration of the array for input message
char message[100];
//declaration of the array for output message
char output[100];
  
//key,count are loop variables
int key, count;
//printing a string to the console
cout<<"Enter encrypted message:";
//reading a line from the console
cin.getline(message,100);
   /*key variable is used in the outer loop to determine the 100 different possibilities of
   encrypting the input message */
for(key=1; key<=100; key++)
{
   /*count variable is used in the inner loop to iterate through input message to
       detemine the each entription message*/
for(count=0; message[count]!=''; count++)
{
   /*encrypting the message based on the 'key'(current number of iteration)*/
if(message[count]-key<32)/*if character at index 'count'(it takes ascii value) -key(current number of iteration)<32 */
output[count]=message[count]-key-32+127;//decryting
else/*else*/
output[count]=message[count]-key;//decryting
}
//printing the each decrypted message
cout<<"Dencrypted message using key"<<key<<":";
cout<<output<<endl;

}
return 0;
}

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