编辑代码

#include <stdio.h>
int main () {
    //JSRUN引擎2.0，支持多达30种语言在线运行，全仿真在线交互输入输出。
    unsigned long long mask = 0;
    mask = mask |(((mask >> 32)| (~(0xffffffffULL << 32)))<< 32); 
    unsigned long long t = 0xffffffffULL << 32;
    unsigned long long test = ~t;
    printf("m:%X t:%X t0:%d   - c.jsrun.net.",mask,test,t);
    return 0;
}