小编use*_*477的帖子

在下面的代码中,我乘以0xffffffff2 unsigned int(32位)并将其存储在unsigned long long(64位)中.为什么我没有得到实际输出8589934588.相反,我得到了4294967294.提前致谢.输出:sizeof i = 4 Sizeof J = 8 2xi = 4294967292

/* Code starts here */
#include <stdio.h>
#include <stdlib.h>

int main (void) 
{
    unsigned int i=4294967294;
    unsigned long long j=i*2;
    printf("Sizeof i=%d\n", sizeof(i));
    printf("Sizeof J=%d\n", sizeof(j));
    printf("2xi=%llu\n", j);

    return 0;
}