*

从两边往中间靠
#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <Windows.h>
#include <stdlib.h>

int main()
{
    char arr1[] = "The world is too dangerous";
    char arr2[] = "                          ";
    int left = 0;
    int right = sizeof(arr1) / sizeof(arr1[0]) - 2;
    //-2的原因是因为字符串最后收尾是\0，而这个\0也算一个底数
    while (left < right)
    {
        arr2[left] = arr1[left];
        arr2[right] = arr1[right];
        printf("%s\n", arr2);
        Sleep(1000);
        system("cls");
        left++;
        right--;
    }
    printf("%s\n", arr2);
    return 0;
}

一个一个打出来
#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <Windows.h>
#include <stdlib.h>

int main()
{
    char arr1[] =  "The world is too dangerous" ;
    char arr2[] =  "                          " ;
    int zs = sizeof(arr1) / sizeof(arr1[0]);
    int left = 0;
    int right = zs - 2;
    int num1 = sizeof(arr1)-1;
    while (left < num1)
    {
        arr2[left] = arr1[left];

        printf("%s\n", arr2);
        Sleep(100);
        system("cls");
        left++;
    }
    printf("%s\n", arr2);
    return 0;
}