How Can I Control Decimal Precision When Outputting Floating-Point Numbers in C ?

Preserving Decimal Precision with cout

In this scenario, where we aim to output specific floating-point values while maintaining a constant decimal place count, the setprecision manipulator from the header emerges as an invaluable tool.

To achieve this desired formatting, consider the following steps:

1. Include both the and headers.
2. Utilize the std::fixed specifier to indicate that you prefer non-scientific notation.
3. Employ std::setprecision(value), setting the specified value to represent the number of desired decimal places.
4. Output your floating-point value.

For instance, consider the following code snippet:

#include <iostream>
#include <iomanip>

int main()
{
    double d = 122.345;

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

This code, when executed, will produce the desired output:

122.34

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