C 中整数的具体位数

c
#include 
#include 
int main() {
    printf("Size of int in bytes: %lu%
", sizeof(int));
    printf("Number of bits in an int: %lu%
", sizeof(int) * CHAR_BIT);
    printf("Size of long in bytes: %lu%
", sizeof(long));
    printf("Number of bits in a long: %lu%
", sizeof(long) * CHAR_BIT);
    return 0;
}

c
#include 
#define BITMASK 0x0F  // 用于提取低四位的位掩码
int main() {
    unsigned char data = 0xAB;  // 10101011 in binary
    // 提取低四位
    unsigned char lowBits = data & BITMASK;
    printf("Original data: 0x%X%
", data);
    printf("Low four bits: 0x%X%
", lowBits);
    return 0;
}