How to keep 2 decimal places in output without rounding in c++

In C, to preserve two decimal places in the output without rounding, you can use the following steps: Use std::fixed to represent floating point numbers with a fixed number of decimal places. Use std::setprecision() to set the number of decimal places to retain, including the decimal point.

How to retain 2 decimal places in C output without rounding

In C, 2 decimal places must be retained To output without rounding, use the std::fixed and std::setprecision() functions.

1. std::fixed

std::fixed Represents a floating point number as a fixed number of decimal places. By default, floating point numbers are represented in scientific notation, while std::fixed converts them to decimal notation, preserving the specified number of digits.

2. std::setprecision()

std::setprecision() Set the number of decimal places to be retained. For floating point numbers, std::setprecision() Specifies the number of decimal places to display, including the decimal point.

Sample code:

<code class="cpp">#include <iostream>
#include <iomanip>

using namespace std;

int main() {
  double value = 123.4567;

  // 保留 2 位小数输出而不四舍五入
  cout << fixed << setprecision(2) << value << endl;

  return 0;
}</code>

Output:

<code>123.45</code>

In this example, std::fixed Converts value to decimal notation while std::setprecision(2) specifies that 2 decimal places be preserved. Therefore, the output is rounded to 2 decimal places without rounding.

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