分离整型每个字节

//分离出一个int数据类型中的每个字节 (get every byte of a int type)

#include <stdio.h>
#include <stdlib.h>

int
main(int argc,char** argv)
{
    
    if (sizeof (int) != 4) {
            fprintf(stderr,"Unkown type!\n");
            return 1;
     }
    int x = 0x0F123FFC;
    unsigned int mask = 0xFF000000;
    
    int array[sizeof(int) + 1] = {0};
    
    int steps = 8;
    int counter;
    for (counter = 1; counter <= 4 ; counter++) {
           
        // printf("%008x------\n",mask);
        //printf("%008x\n********",(x & mask));
            array[counter] = ((x & mask) >> (32-steps*counter));  //提取每个字节并去除多余的0 (get every byte and remove 0)
        //printf("%008x\n",(x & mask) >> (32-steps*counter) );
            mask >>= steps;   //掩码右移8位  (mask right shift 8 bits)
            
     }
     
    for (counter = 1; counter <= 4 ; counter++) {
            printf("byte[%d]: %002x\n",counter,array[counter]);
     }
    
     
    return 0;
}

更多资源 Crusher-Int