How Can I Achieve Precise Floating-Point Output with `cout` in C ?

Maintaining Precision in Floating-Point Output with cout

When attempting to display floating-point values with specific decimal place precision using cout, setprecision() may not yield satisfactory results. To ensure accurate precision, consider the following approach:

Utilizing Header:

The header library provides additional tools for controlling floating-point formatting, particularly with the std::fixed and std::setprecision functions.

Example Usage:

#include <iostream>
#include <iomanip>

int main() {
    double value = 122.345;
    std::cout << std::fixed << std::setprecision(2) << value;
}

Explanation:

• std::fixed ensures that the decimal point is always displayed.
• std::setprecision(2) explicitly specifies the desired decimal place count.

By incorporating this approach, you can effectively print floating-point values with the desired number of decimal places. In the example above, the output will be "122.34", with two decimal places.

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