相关疑难解决方法(0)

不知道为什么，但如果我将大到小的 fp 数字相加，似乎增量误差会更大：

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

int main() {
    std::cout.precision(50);

    const int numLoops = 1000;
    const long length = 10000;
    const double rate = 0.1;

    long totalLength = length * numLoops;
    long long steps = (long long)(totalLength / rate);

    double sum = 0.0;
    double sumRemainder = 0.0;
    for (long long step = 0; step < steps; step++) {
        if (sumRemainder >= length) {
            sumRemainder = fmod(sumRemainder, length);
        }

        sum += rate;
        sumRemainder += rate;
    }

    std::cout << …