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cpp 浮点的 ceil 计算和其它语言不一致的问题

 3 years ago
source link: https://www.v2ex.com/t/846153
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V2EX  ›  C++

cpp 浮点的 ceil 计算和其它语言不一致的问题

  dusu · 13 小时 25 分钟前 · 618 次点击

各位大佬，最近在学 c++11 ，代码如下: 

#include <iostream>
#include <math.h>

using namespace std;

int64_t random(int64_t seed){
    uint64_t result;
    result = (seed * 33 + 49297) % 23680;
    result = ceil((result * 10000000) / 23680);
    return result;
}


int main(){
    cout << random(1) << endl;
}

831925

   var seed = 1;
   result = (seed * 33 + 49297) % 23680;
   result = Math.ceil((result * 10000000) / 23680);
   console.log(result);

试了几个语言都是输出：

831926

c++ 结果如果是偶数的时候正常

出问题的结果都在奇数上

请问要怎么调整才能达到输出 js 的结果？

请大佬们赐教


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