C语言入门篇--充分理解操作符

#include <stdio.h>
int main()
{
	int x = 15;
	printf("%d\n", x>>1);
	printf("%d\n", x<<1);
	printf("%d\n", x);
	x = x >> 1;
	printf("%d\n", x);
	return 0;
}

#include <stdio.h>
int main()
{
	printf("%d\n", 1 & 1);
	printf("%d\n", 0 & 1);
	printf("%d\n", 1 & 0);
	printf("%d\n", 0 & 0);
	printf("%d\n", 2 & 6);	
	return 0;
}

#include <stdio.h>
int main()
{
	printf("%d\n", 1 | 1);
	printf("%d\n", 0 | 1);
	printf("%d\n", 1 | 0);
	printf("%d\n", 0 | 0);
	printf("%d\n", 2 | 6);
	return 0;
}

#include <stdio.h>
int main()
{
	printf("%d\n", 1 ^ 1);
	printf("%d\n", 0 ^ 1);
	printf("%d\n", 1 ^ 0);
	printf("%d\n", 0 ^ 0);
	printf("%d\n", 2 ^ 6);
	return 0;
}

#include <stdio.h>
int main()
{
	int x1 = 0;
	x1 = 10;//赋值 从右向左赋值
	printf("%d\n", x1);
	int x2 = 20;
	x2 += 10;//加等 等价于x=x+10; //其他操作符类似
	printf("%d\n", x2);
	return 0;
}

#include<stdio.h>
int main()
{
	int flag = 1;
	if (!flag)//(flag==1)条件为真即非零，取反（!)后if条件为假即0
	{
		printf("if条件为真!\n");
	}
	else
	{
		printf("if条件为假!\n");
	}
	return 0;
}

#include <stdio.h>
#include <windows.h>
int main()
{
	int x1 = 10;
	printf("%d\n", +x1);
	printf("%d\n", -x1);
	int x2 = -10;
	printf("%d\n", +x2);
	printf("%d\n", -x2);
	return 0;
}

#include <stdio.h>
int main()
{
	int x = 10;
	printf("%d\n", x);
	printf("0x%p\n", &x);//%p:以十六进制打印地址；加0x：为了打印出来的是变量所对应的标准地址。
	return 0;
}

#include <stdio.h>
int main()
{
	unsigned x = 1;
	printf("%u\n", x);
	printf("%u\n", ~x);
	return 0;
}

#include <stdio.h>
int main()
{
	int i = 3;
	int a = i++;
	printf("%d\n", i);
	printf("%d\n", a);
	///
	int j = 10;
	int b = ++j;
	printf("%d\n", j);
	printf("%d\n", b);	
	return 0;
}

#include <windows.h>
int main()
{
	int a = 10;
	int *p = &a;//指针p指向变量a
	int b=*p;//*p即解引用指针p，取出指针p所指地址空间里的值,然后赋给变量b
	printf("%d\n", b);
	return 0;
}

#include <stdio.h>
int main()
{
	int a = 10;
	double b = 3.456;
	a = b;//隐式转换
	printf("%d\n", a);
    ///
	int c = 20;
	double d = 5.555;
	c = (int)d;//显式转换
	printf("%d\n", c);	
	return 0;
}

#include <stdio.h>
int main()
{
	int a = 10;
	int b = 20;
	int c = 0;
	int d = ((c=a+b), 2, 3, 4, 5, 6, 7);
	printf("c=%d\n", c);
	printf("d=%d\n", d);
	return 0;
}