2022.07.08 C 总结基础篇

1-12课时

梦想开始的地方

#include <stdio.h>
int main()
{
 printf("%s\n","hello,world");
 return 0;
}
 
常见位运算
此处有题目留空
#include <stdio.h>
int main()
{
printf("c = %d\n",5 | 2);
printf("c = %d\n",7 ^ 8);
printf("c = %d\n",(15 >> 2) & 13);
printf("c = %d\n",173 ^ 60);

return 0;
}
运行结果如下：
c = 7
c = 15
c = 1
c = 145
 
 
#include <stdio.h>
int main()
{
char c = 'A';
short a = c;
int b = c;

printf("c = %c\n",c);
printf("c = %d\n",c);
printf("a = %d\n",a);
printf("b = %d\n",b);

c = 0x40;
printf("c = %x\n",c);
printf("c = %d\n",c);

c = c << 1;
printf("c = %d\n",c);
c = c << 2;
printf("c = %d\n",c);

return 0;
}
运行结果如下：
c = A
c = 65
a = 65
b = 65
c = 40
c = 64
c = -128
c = 0
 
移位小结
整数符号位为0右移运算符时高位补0低位移除
负数符号位为1时，右移运算时高位补1低位移除
左移运算时高位移除低位补0
最高位的具体位置，有数据类型决定

最后三位输出64 << 1 =-128  -128<< 1 = 0
get到了吗？欢迎评论留言！