unsigned long long的问题

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#include <stdio.h>int main(){        unsigned long long aaa = 0;        aaa = 0xffffffff * 0xffffffff;        bbb = (unsigned long long)0xffffffff * (unsigned long long)0xffffffff;                printf("aaa=%llu    bbb=%llu\n", aaa, bbb);        return 0;}


运行结果为:

aaa=1

bbb=18446744065119617025


问题待思考!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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