Cryptare string Cifrul lui Cezar

#include <conio.h>
#include <stdio.h>
#include <stdlib.h>

void main()
{
    int nr = 0, o=0;
    char key, v[10];

    printf("Offset:");
    scanf_s("%d", &o);
    printf("\nPlainText:");

    for (int i = 0; i < 200; i++) {
        key = _getch();
        v[i] = key;
        printf("%c", key);
        nr++;
        if (v[i] + o > 126)
            break;
        else if (v[0] == 32)
            break;
        else if (v[i] == 27)
            break;
        else if (v[i] == 13)
            break;
        else if (v[i] == 14 || v[i] == 15) {
            key = _getch();
            v[i] = key;
        }

    }

    printf("\nOutput:\n");

    for (int i = 0; i < nr-1; i++) {
        v[i] = v[i] + o;
        printf("%c",v[i]);
    }

    _getch();
    exit(0);
}