位操作习题1

ゝ一纸荒年。 2022-08-23 11:59 126阅读 0赞

/*
    位操作运算练习
    将某无符号整型数据的第0-3位清零
    将某无符号整型数据的第4-7位置1
    将某无符号整型数据的第0-3位取反
    */
    
    #include <stdio.h>
    
    int main(void)
    {
    	unsigned n;
    	scanf("%x", &n);
    	printf("0-3 clear:0x%x\n", n & 0xfffffff0);
    	printf("4-7 set 1:0x%x\n", n | 0x000000f0);
    	printf("0-3 set ~:0x%x\n", n ^ 0x0000000f);
    
    	return 0;
    }

//判断某个数是奇数还是偶数
    
    #include <stdio.h>
    
    int main(void)
    {
    	unsigned n,tmp;
    	scanf("%x", &n);
    	tmp = n & 0x00000001;
    	if(tmp == 0x01){
    		printf("odd\n");
    	}else printf("even\n");
    	
    
    
    	return 0;
    }

/*
    通过位运算将整型数据的某些位清零
    通过位运算将整型数据的某些位置1
    unsigned cleanbits(unsigned int n, int start, int end)
    unsigned setbits(unsigned int n, int start, int end)
    
    */
    
    #include <stdio.h>
    
    unsigned cleanbits(unsigned n, int start, int end)
    {	
    	unsigned tmp;
    	tmp = n &  ~( ~( (~0) << (end - start + 1) ) << start );
    	printf("before:0x%x\ncleanbits:0x%x\n", n, tmp);
    	return 0;
    }
    unsigned setbits(unsigned n, int start, int end)
    {	
    	unsigned tmp;
    	tmp = n | ~( (~0) << (end - start + 1) ) << start;
    	printf("before:0x%x\nsetbits:0x%x\n", n, tmp);
    	return 0;
    }
    
    
    int main(void)
    {
    	unsigned n;
    	int start, end;
    	printf("输入整形数据n，起始bits位start的值,结束bits位end的值\n");
    	scanf("%x%d%d", &n, &start, &end);
    	cleanbits(n, start, end);
    	setbits(n, start, end);
    	return 0;
    }<pre name="code" class="cpp">
    输入整形数据n，起始bits位start的值,结束bits位end的值
    256 0 3
    before:0x256
    cleanbits:0x250
    before:0x256
    setbits:0x25f
    etbits(unsigned intn, intstart, intend)

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[Center]: https://img-blog.csdn.net/20140718140620642?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbGluYm91bmNvbnN0cmFpbnQ=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: /images/20220823/f2e34b6a0fdc4b1a823f7ead7141edac.png