#include<stdio.h>
int main()
{
    unsigned char ke[4*4] = {   0x2b, 0x7e, 0x15, 0x16,   
                        0x28, 0xae, 0xd2, 0xa6,   
                        0xab, 0xf7, 0x15, 0x88,   
                        0x09, 0xcf, 0x4f, 0x3c};
    printf("密钥是：\n");
    for(int i=0;i<16;i++)
    {
        printf("%4s",ke[i]);
        if(i%4==0)
            printf("\n");
    }
}

试试
//printf("%4s",ke[i]);
printf("%c",ke[i]);

都没用

懂了  这是十六进制 打印要用%x

打扰各位大佬了