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191. Write code for Ceaser Cipher Algorithm to encrypt/decrypt messages.
Microsoft Interview Questions and Answers
(Continued from previous question...)
191. Write code for Ceaser Cipher Algorithm to encrypt/decrypt messages.
Question:
Write code for Ceaser Cipher Algorithm to encrypt/decrypt messages.
maybe an answer:
#include <stdio.h>
#include <string.h>
void encrypt_decrypt_String(int kShift, int pOption);
int main()
{
int option = 0;
int shift = 0;
printf("Enter the shift for caeser cipher..\n");
scanf("%d",&shift);
printf("Enter 1 to encrypt and 0 to decrypt..\n");
scanf("%d",&option);
while(getchar() != '\n');
encrypt_decrypt_String(shift, option);
}
void encrypt_decrypt_String(int kShift, int pOption)
{
char ch;
ch = getchar();
while(ch != '\n')
{
if(ch == ' ')
{
putchar(' ');
}
else
{
if(pOption == 1)
{
if(isupper(ch))
{
putchar('A' + (ch + kShift - 'A')%26);
}
else
{
putchar('a' + (ch + kShift - 'a')%26);
}
}
else if(pOption == 0)
{
if(isupper(ch))
{
putchar('Z' + (ch - kShift - 'Z')%26);
}
else
{
putchar('z' + (ch - kShift - 'z')%26);
}
}
else
{
printf("Option not supported..\n");
break;
}
}
ch = getchar();
}
putchar(ch);
}
(Continued on next question...)
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