Research on the application of bitwise operations in C language in Linux

A study on the application of bit operations in C language in Linux

In computer science, bit operations are an operation on binary numbers. Typically used to handle low-level data representation and optimize program performance. In Linux systems, the application of bit operations in C language has wide practical significance and can help programmers solve problems more efficiently. This article will explore the basic knowledge of bitwise operations in C language under Linux environment, and give specific code examples to demonstrate its application.

1. Basic knowledge of bit operations

Bit operations are operations on binary bits, which mainly include bitwise AND (&), bitwise OR (|), and bitwise XOR (^ ), bitwise negation (~) and other operations. In C language, bit-level operations can be performed using these operators. Specifically:

• Bitwise AND (&): The result is 1 when the corresponding bits of both operands are 1, otherwise it is 0.
• Bitwise OR (|): As long as one of the corresponding bits of the two operands is 1, the result is 1, otherwise it is 0.
• Bitwise XOR (^): If the corresponding bits of the two operands are the same, the result is 0, if they are different, the result is 1.
• Bitwise negation (~): negate each bit of the operand.

2. Code examples

Below we give some specific code examples to show the application of bit operations in C language under Linux environment:

2.1 Bit Operation to realize exchange of two numbers

#include <stdio.h>

void swap(int *a, int *b) {
    *a = *a ^ *b;
    *b = *a ^ *b;
    *a = *a ^ *b;
}

int main() {
    int x = 10, y = 20;
    printf("Before swap: x=%d, y=%d
", x, y);
    swap(&x, &y);
    printf("After swap: x=%d, y=%d
", x, y);
    return 0;
}

2.2 Check parity

#include <stdio.h>

int isOdd(int num) {
    return num & 1;
}

int main() {
    int num = 5;
    if (isOdd(num)) {
        printf("%d is an odd number
", num);
    } else {
        printf("%d is an even number
", num);
    }
    return 0;
}

2.3 Set a certain bit to 1

#include <stdio.h>

void setBit(int *num, int pos) {
    *num |= (1 << pos);
}

int main() {
    int num = 5;
    int pos = 2;
    printf("Before setting bit %d: %d
", pos, num);
    setBit(&num, pos);
    printf("After setting bit %d: %d
", pos, num);
    return 0;
}

3. Summary

Through the above code example, We showed off the Linux ring

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