Caesar Cipher

Lab C Intermediate 20 points

Read a shift k and a line. Shift letters by k (wrapping, keeping case); leave other characters unchanged.

Input

Line 1: k (0–25). Line 2: text.

Output

The encoded text.

Example

Input

3
Hello, World!

Output

Khoor, Zruog!

Sample input available Sample output available

Editor

Hints

After scanf, getchar() eats the leftover new line before fgets.

Work with positions 0-25 and use % 26.

Solution explanation

Mixing scanf and fgets needs care: scanf leaves the new line behind.

Show solution

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

int main() {
    int k;
    char s[300];
    scanf("%d", &k);
    getchar();
    fgets(s, 300, stdin);
    s[strcspn(s, "\n")] = '\0';
    for (int i = 0; s[i] != '\0'; i++) {
        if (s[i] >= 'a' && s[i] <= 'z') s[i] = 'a' + (s[i] - 'a' + k) % 26;
        else if (s[i] >= 'A' && s[i] <= 'Z') s[i] = 'A' + (s[i] - 'A' + k) % 26;
    }
    printf("%s\n", s);
    return 0;
}

Output

Answer