set precision in c++

To set precision in C++, you can use the std::setprecision function from the <iomanip> library. The std::setprecision function allows you to specify the number of digits to be displayed after the decimal point. Here is an example of how to use it:

#include <iostream>
#include <iomanip>

int main() {
    double number = 3.14159265359;

    std::cout << std::setprecision(4) << number << std::endl;

    return 0;
}

In this example, we have a variable number with the value of pi (approximately 3.14159265359). By calling std::cout with std::setprecision(4) before number, we are setting the precision to 4 decimal places. The output will be:

3.142

The std::setprecision function takes an integer argument that represents the number of digits to be displayed after the decimal point. It affects the output of the std::cout stream and can be used to format floating-point numbers. By default, the precision is set to 6 digits.

Please note that the std::setprecision function affects the entire stream, so any subsequent floating-point numbers outputted using std::cout will have the same precision unless explicitly changed.

I hope this explanation helps! Let me know if you have any further questions.