Write a C program that will encrypt and decrypt messages using a basic shift cip

Question

Write a C program that will encrypt and decrypt messages using a basic shift cipher. This cipher works by simply shifting the characters of the string by a known number. For example, if we shift the string "programming" by one letter, we would get "qsphsbnnjoh"

The letter after p is q The letter after r is s The letter after o is p ... and so on

Your program should:
-ask the user if they want to encrypt or decrypt a message
-ask the user for a numerical "key" value by which to shift the characters
-let the user type in a message up to 500 characters in length that will be encrypted or decrypted
-use at a minimum:

-functions -strings -loops
-if statements

Recommended functions to get you started: -encrypt
-decrypt
-getUserInput

Explanation / Answer

Program:

#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
int i;
char str[30];
clrscr();
printf(" Enter any string : ");
gets(str);
for(i=0; str[i]!=''; i++)
{
if(str[i]>='a' && str[i]<='z')
{
str[i]=str[i]+1;
}
printf("%c",str[i]);
}
getch();
}

Output:
Enter any string : programming
qsphsbnnjoh

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