//编译环境：codeblocks+gcc #include <stdio.h> #include <stdint.h> int Fun() {     uint64_t y;     uint32_t x1, x2;     //y = 3000 * 24000000 / 1000;//常数默认作为32位数据，临时运算结果也是32位，溢出错误     //y = (uint64_t)3000 * (uint64_t)24000000 / 1000;//常数强制转换为64位，运算正确     y = 3000ULL * 24000000ULL / 1000ULL;//常数使用64位格式，运算正确     printf("0x%llX\n", y);//输出     x1 = (uint32_t)(y & 0xFFFFFFFF);     x2 = (uint32_t)(y >> 32);     printf("0x%X,0x%X \n", x1, x2);//输出结果 } int main() {     Fun(); }