Hiding the contents of communications that can be viewed by entities other than

Question

Hiding the contents of communications that can be viewed by entities other than the intended recipient could be done by encoding the message using a cypher and possibly a key known only the transmitting and receiving entities. Write a program that does the following. 1- Prompts the user to enter a word that is six letters long (all upper case). 2- Reads each character into a character type variable. 3- Ask the user for a cipher key, an integer between 2 and 8. 4- Store the Cipher key in an integer variable. 5- Add cipher key value to the ASCII value of each character. 6- Output the integer values adjusted by the cipher key on one line in the same order as the input with no spaces in between.

Explanation / Answer

#include <iostream>
#include <string.h>
#include <stdio.h>
using namespace std;
int main()
{
char ch[10];
int i, num;
printf(" Enter a word of 6 characters in UPPERCASE: ");
scanf("%s", ch);
printf(" Enter an Cipher Key as Integer value between 2 and 8: ");
scanf("%d",&num);
printf(" Cipher Key is = %d ",num);
printf(" The Cipher Value is: ");
for(i = 0; i < 6; i++)
{
//printf(" ASCII value of %c is %d", ch[i], ch[i]);
printf("%d",ch[i] + num);
}
return 0;
}

OUTPUT

Enter a word of 6 characters in UPPERCASE: STRING
Enter an Cipher Key as Integer value between 2 and 8: 6
Cipher Key is = 6
The Cipher Value is: 899088798477

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