char

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
main()
{
    char x = 040;
    printf("%o\n",x<<1);
    printf("%d\n",x);
    char y = '\040';
    printf("%c\n",y);
    
    char z = 'z';
    printf("%c",z);
}

结果
100
32

z
\040 => 0010 0000 ASCII中32是换行

x = 040 是八进制
%o也是输出八进制