#include<iostream>
using namespace std;

char he[] = {"hello world"};
int i;

int main()
{
    while(he[i] != 0)
    {
        he[i] += 1;
        cout << he[i];
        i++;       
    }

    return 0;
}

参考答案：

#include<iostream>
#include<cstring>
using namespace std;

char a[12];
int main()
{
    int i = 0;
    while (scanf("%c", &a[i]) != -1) ++i;

    for (int j = 0; j < i; ++j) printf("%c", a[j] + 1);
  
    return 0;
}