清除緩存 c語言

Given a number and we have to 1) set a bit, 2) clear a bit and 3) toggle a bit.

給定一個數字，我們必須1)設置一個位，2)清除一個位，3)切換一個位。

1)設置一點 (1) Setting a bit)

To set a particular bit of a number, we can use bitwise OR operator (|), it sets the bits – if the bit is not set, and if the bit is already set, bit’s status does not change.

要設置數字的特定位，我們可以使用按位或運算符( | )，它設置位–如果未設置位，并且如果該位已設置，則位的狀態不會改變。

Let suppose there is a number num and we want to set the X^th bit of it, then the following statement can be used to set X^th bit of num

讓我們假設有一個數NUM，我們要設置X的^第這一點，那么下面的語句可以用來設置X的num ^個位

num |= 1 << x;

2)清除一點 (2) Clearing a bit)

To clear a particular bit of a number, we can use bitwise AND operator (&), it clears the bit – if the bit is set, and if the bit is already cleared, bit’s status does not change.

要清除數字的特定位，我們可以使用按位AND運算符(＆)，清除該位–如果該位已設置，并且如果該位已被清除，則位的狀態不會更改。

Let suppose there is a number num and we want to clear the X^th bit of it, then the following statement can be used to clear X^th bit of num

讓我們假設有一個數NUM，我們要清除的^第 X的這一點，那么下面的語句可以用于清除X的num ^個位

num &= ~(1 << x);

3)切換一點 (3) Toggling a bit)

To toggle a particular bit of a number, we can use bitwise XOR operator (^), it toggles the bit – it changes the status of the bit if the bit is set – it will be un-set, and if the bit is un-set – it will be set.

要切換某個數字的特定位，我們可以使用按位XOR運算符(^)，它會切換該位–如果該位被設置，它將更改該位的狀態–將被取消設置，并且如果該位未被設置， -set –將被設置。

Let suppose there is a number num and we want to toggle the X^th bit of it, then the following statement can be used to toggle X^th bit of num

讓我們假設有一個數NUM，我們要切換X的^第這一點，那么下面的語句可以用來切換^第 X NUM位

num ^= 1 << x;

Consider the following code – Here, we are performing all above mentioned operations

考慮以下代碼–在這里，我們正在執行上述所有操作

#include <stdio.h>int main(){//declaring & initializing an 1 byte number/*num (hex) = 0xAAits binary = 1010 1010its decimal value = 170*/unsigned char num = 0xAA; printf("num = %02X\n", num);//setting 2nd bit num |= (1<<2);//now value will be: 1010 1110 = 0xAE (HEX) = 174 (DEC)printf("num = %02X\n", num);//clearing 3rd bit num &= ~(1<<3);//now value will be: 1010 0110 = 0xA6 (HEX) = 166 (DEC)printf("num = %02X\n", num); //toggling bit 4th bitnum ^= (1<<4);//now value will be: 1011 0110 = 0xB6 (HEX) = 182 (DEC)printf("num = %02X\n", num);//toggling bit 5th bitnum ^= (1<<5);//now value will be: 1001 0110 = 0x96 (HEX) = 150 (DEC)printf("num = %02X\n", num); return 0; }

Output

輸出量

num = AA num = AE num = A6 num = B6 num = 96

Read more...

...

• Hexadecimal literals in C language

  C語言的十六進制文字

• Working with hexadecimal values in C language

  使用C語言處理十六進制值

• How to check whether a bit is SET or not in C language?

  如何檢查C語言中的SET是否設置？

• unsigned char in C language

  C語言中的未簽名字符

• Bitwise operator programs in C

  C語言中的按位運算符程序

翻譯自: https://www.includehelp.com/c/how-to-set-clear-and-toggle-a-single-bit-in-c-language.aspx

清除緩存 c語言

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