//編譯環(huán)境：codeblocks+gcc
#include <stdio.h>
#include <stdint.h>
int Fun()
{
    uint64_t y;
    uint32_t x1, x2;

    //y = 3000 * 24000000 / 1000;//常數(shù)默認(rèn)作為32位數(shù)據(jù)，臨時(shí)運(yùn)算結(jié)果也是32位，溢出錯(cuò)誤
    //y = (uint64_t)3000 * (uint64_t)24000000 / 1000;//常數(shù)強(qiáng)制轉(zhuǎn)換為64位，運(yùn)算正確
    y = 3000ULL * 24000000ULL / 1000ULL;//常數(shù)使用64位格式，運(yùn)算正確

    printf("0x%llX\n", y);//輸出
    x1 = (uint32_t)(y & 0xFFFFFFFF);
    x2 = (uint32_t)(y >> 32);
    printf("0x%X,0x%X \n", x1, x2);//輸出結(jié)果
}
int main()
{
    Fun();
}