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/******************************************************************************
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Code, Compile, Run and Debug C++ program online.
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*******************************************************************************/
#include <iostream>
#include <string>
using namespace std;
char caesar(char);
int main()
{
string input;
do
{
cout << "Enter cipertext and press enter to continue." << endl;
cout << "Enter blank line to quit." << endl;
getline(cin, input);
string output = "";
for (int x = 0; x < input.length(); x++)
{
output += caesar(input[x]);
}
cout << output << endl;
}
while (!input.length() == 0);
} //end main
char caesar(char c)
{
if (isalpha(c))
{
c = toupper(c); //use upper to keep from having to use two seperate for A..Z a..z
c = (((c - 65) + 13) % 26) + 65;
}
//if c isn't alpha, just send it back.
return c;
}
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