C++ 计算分数的浮点数值 (双精度浮点数，保留小数点后9位)

#include #include

int main() { int a, b; std::cin >> a >> b;

double result = static_cast<double>(a) / b;
std::cout << std::fixed << std::setprecision(9) << result << std::endl;

return 0;

}