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#include <stdio.h>
#include <cs50.h>
#include <string.h>
int main (int argc , string argv[])
{
    string k = argv[1];
    if (argc != 2)
    {
        printf("Error, Enter one word made of alphabetical characters");
        return 1;
    }
    else 
    {
        for (int i = 0, n = strlen(k); i < n; i++)
        {
            if (!((k[i] >= 'a' && k[i] <= 'z') || (k[i] >= 'A' && k[i] <= 'Z')))
            {
                printf("Error, Enter one word made of alphabetical characters");
                return 1;
            }
        }
        printf("plaintext:");
        string p = get_string();
        printf("ciphertext:");
        for (int j = 0 , i = 0, n = strlen(p); j < n; j++)
        {
 
            if (i>= strlen(k))
            {
                i = 0;
            } 
            int s = p[j] + k[i] - 'a';
            int c = p[j] + k[i] - 'A';
            if (k[i] >= 'A' && k[i] <= 'Z')
            {
               k[i] = k[i] + 32;
            }
            if ((p[j] >= 'a' && p[j] <= 'z' && s > 'z' ) || (p[j] >= 'A' && p[j] <= 'Z' && c > 'Z'))
            {
                printf("%c" , p[j] + k[i] - 'a' - 26);
            }
            else if ((p[j] >= 'a' && p[j] <= 'z') || (p[j] >= 'A' && p[j] <= 'Z'))
            {
                printf("%c" , p[j] + k[i] - 'a');
            }    
            else
            {
                printf("%c" , p[j]);
            }
            i++;
        }     
        printf("\n");
        return 0;
    }
}

Main.java:1: error: illegal character: '#'
#include <stdio.h>
^
Main.java:1: error: class, interface, or enum expected
#include <stdio.h>
         ^
Main.java:2: error: illegal character: '#'
#include <cs50.h>
^
Main.java:3: error: illegal character: '#'
#include <string.h>
^
Main.java:7: error: class, interface, or enum expected
    if (argc != 2)
    ^
Main.java:10: error: class, interface, or enum expected
        return 1;
        ^
Main.java:11: error: class, interface, or enum expected
    }
    ^
Main.java:14: error: class, interface, or enum expected
        for (int i = 0, n = strlen(k); i < n; i++)
                                       ^
Main.java:14: error: class, interface, or enum expected
        for (int i = 0, n = strlen(k); i < n; i++)
                                              ^
Main.java:19: error: class, interface, or enum expected
                return 1;
                ^
Main.java:20: error: class, interface, or enum expected
            }
            ^
Main.java:23: error: class, interface, or enum expected
        string p = get_string();
        ^
Main.java:24: error: class, interface, or enum expected
        printf("ciphertext:");
        ^
Main.java:25: error: class, interface, or enum expected
        for (int j = 0 , i = 0, n = strlen(p); j < n; j++)
        ^
Main.java:25: error: class, interface, or enum expected
        for (int j = 0 , i = 0, n = strlen(p); j < n; j++)
                                               ^
Main.java:25: error: class, interface, or enum expected
        for (int j = 0 , i = 0, n = strlen(p); j < n; j++)
                                                      ^
Main.java:31: error: class, interface, or enum expected
            } 
            ^
Main.java:33: error: class, interface, or enum expected
            int c = p[j] + k[i] - 'A';
            ^
Main.java:34: error: class, interface, or enum expected
            if (k[i] >= 'A' && k[i] <= 'Z')
            ^
Main.java:37: error: class, interface, or enum expected
            }
            ^
Main.java:41: error: class, interface, or enum expected
            }
            ^
Main.java:45: error: class, interface, or enum expected
            }    
            ^
Main.java:49: error: class, interface, or enum expected
            }
            ^
Main.java:51: error: class, interface, or enum expected
        }     
        ^
Main.java:53: error: class, interface, or enum expected
        return 0;
        ^
Main.java:54: error: class, interface, or enum expected
    }
    ^
26 errors

Standard output is empty