char好像只能存到127，就先用int存了一下，大佬们能不能看看有啥错误吗

#define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>
#include<stdlib.h>
void test01()
{
    int i = 0, dis = 0;
    char str[51];

    scanf("%d", &dis);
    scanf("%s", str);

    for (i = 0; str[i] != '\0'; i++)
    {
        int temp = str[i] + dis;
        while (temp > 122)
            temp -= 26;
        str[i] = temp;
        putchar(str[i]);
    }
}

int main()
{
    test01();
    return 0;
}