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Caeser

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Yamna
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17 views1 page

Caeser

Uploaded by

Yamna
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as TXT, PDF, TXT or read online on Scribd
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#include <cs50.

h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, string argv[])


{
if (argc != 2)
{
printf("Usage: ./caeser key\n");
return 1;
}

for (int i = 0; i < strlen(argv[1]); i++)


{
if (!isdigit(argv[1][i]))
{
printf("Usage: ./caeser key\n");
return 1;
}
}

int k = atoi(argv[1]);

string plaintext = get_string("Plaintext: ");


printf("Ciphertext: ");

for (int j = 0; j < strlen(plaintext); j++)


{
if (isupper(plaintext[j]))
{
printf("%c", (plaintext[j] - 65 + k) % 26 + 65);
}

else if (islower(plaintext[j]))
{
printf("%c", (plaintext[j] - 97 + k) % 26 + 97);
}

else
{
printf("%c", plaintext[j]);
}
}
printf("\n");
}

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