{0}可以数组初始化全为0，{1}不能数组初始化全为1

实验程序：

#include "stdio.h"
#include "string.h"

void main(void)
{
    unsigned char a[100]={0};
    unsigned char  b[100]={1};
    int i;

    for(i = 0; i< 100; i++)
    {
        printf("%02x ",a[i]);
    }
    printf("n");
    for(i = 0; i< 100; i++)
    {
        printf("%02x ", b[i]);
    }
    printf("n");

    memset(b, 1, 100);
    for(i = 0; i< 100; i++)
    {
        printf("%02x ", b[i]);
    }
    printf("n");
}

运行结果：

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01

参考 ：

C语言 数组初始化的三种常用方法（{0}, memset, for循环赋值）以及原理_谁吃薄荷糖-CSDN博客_c语言数组赋值

最后

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