set precision in c++ no decimal places\

To set precision in C++ and specify the number of decimal places, you can make use of the std::setprecision function from the <iomanip> library. The steps to achieve this are as follows:

1. Include the <iomanip> library at the beginning of your program.
2. Use the std::setprecision function, followed by the desired number of decimal places, to set the precision for floating-point numbers.
3. Use the std::fixed function to ensure that the precision is applied to the decimal part of the number.
4. Call the std::cout or std::ofstream object to display or write the values with the desired precision.

Here's an example that demonstrates how to set precision in C++ and display a floating-point number with two decimal places:

#include <iostream>
#include <iomanip>

int main() {
    double number = 3.14159;
    std::cout << std::fixed << std::setprecision(2) << number << std::endl;
    return 0;
}

In this example, the std::fixed manipulator ensures that the precision is applied to the decimal part of the number. The std::setprecision(2) sets the precision to two decimal places. The output will be 3.14.

You can adjust the precision value as per your requirements.