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Add Codedump

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#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <ctype.h>

int main (int argc, string argv[]){

///turn command line string into int///

int s = atoi(argv[1]);

//return error message for no command line arg///

if (argc!=2) {

printf("Error: No command line argument\n");
        return 1;
    }

//prompt user for plaintext//

printf("Enter plaintext: ");
        string p = get_string();

//print loop for ciphertext//

printf("ciphertext: ");

int n = strlen(p);

for (int i=0; i<n; i++) {

//if char is alphabetical inner loops preserve case//

if (isalpha(p[i])) {

if (isupper(p[i])) {

char l = (p[i]-65) + s%26;
                printf("%c", l+65);
            }

if (islower(p[i])) {

char m = (p[i]-97) + s%26;
                printf("%c", m+97);
            }

}

///if not a letter, prints as is//

if (isalpha(p[i]) == false) {

printf("%c", p[i]);

}
    }

///print new line after ciphertext///

printf("\n");

printf("argv1 is %i\n", s);

}

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