C/C ++中两个INT_MAX numbes的乘积不正确 [英] Incorrect product of two INT_MAX numbes in C/C++

问题描述

在我的情况下，两个INT_MAX数字的乘积为296447233，这是不正确的.

In my case, product of two INT_MAX numbers is 296447233, which is incorrect.

long long int product = 0;
product = 2137483647 * 2137483647;
printf("product: %lli\n", product);

我在做错什么，以及如何纠正它? 谢谢！

What I am doing wrong, and how to correct it ?? Thanks !

推荐答案

您的2137483647都属于int类型.因此，它们保持该类型并溢出.

Both of your 2137483647 are of type int. So they stay that type and overflow.

让他们long long s:

product = 2137483647LL * 2137483647LL;

或演员:

product = (long long)2137483647 * 2137483647;

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