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- #include <stdlib.h>
- #include <cs50.h>
- #include <stdio.h>
- #include <string.h>
- #include <ctype.h>
- int main(int argc, string argv[])
- {
- if (argc != 2)
- {
- printf("Invalid key!");
- return 1;
- }
- else
- {
- string m = argv[1];
- int k = atoi(m);
- string p = GetString();
- string c = p;
- for (int i = 0, n = strlen(p); i < n; i++)
- {
- if(isalpha(p[i]))// проверка на то, буква ли это алфавита
- {
- if(islower(p[i]))// нижний регистр
- {
- c[i] = (((p[i] - 97) + k) % 26) + 97;
- }
- else //верхний регистр
- {
- c[i] = (((p[i] - 65) + k) % 26) + 65;
- }
- printf("%c",c[i]);
- }
- else
- {
- printf("%c",c[i]);
- }
- }
- printf("\n");
- return 0;
- }
- }
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