使用 cout 打印正确的小数位数

2022-01-30 00:00:00 c++

我有一个 float 值列表，我想用 cout 打印它们，并保留 2 个小数位.

I have a list of float values and I want to print them with cout with 2 decimal places.

例如:

10.900  should be printed as 10.90
1.000 should be printed as 1.00
122.345 should be printed as 122.34

我该怎么做?

(setprecision 似乎对此没有帮助.)

( setprecision doesn't seem to help in this.)

推荐答案

通过<iomanip>，你可以使用std::fixed 和 std::setprecision

With <iomanip>, you can use std::fixed and std::setprecision

这是一个例子

#include <iostream>
#include <iomanip>

int main()
{
    double d = 122.345;

    std::cout << std::fixed;
    std::cout << std::setprecision(2);
    std::cout << d;
}

你会得到输出

122.34

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