how to specify how many decimal to print out with std::cout

#include <iostream>
#include <iomanip>

int main() {
    double number = 3.14159;

    std::cout << std::fixed << std::setprecision(3) << number << std::endl;

    return 0;
}

Explanation:

• #include <iostream>: Includes the input-output stream header file for handling input and output operations.

• #include <iomanip>: Includes the input-output manipulator header file for manipulator functions to format output.

• double number = 3.14159;: Declares and initializes a double variable named number with the value 3.14159.

• std::cout: Standard output stream used for printing data to the console.

• std::fixed: Manipulator flag that sets the floating-point output format to fixed-point notation.

• std::setprecision(3): Manipulator function that sets the precision for floating-point output to 3 decimal places.

• << number << std::endl;: Outputs the value of the number variable to the console with a precision of 3 decimal places using std::cout. std::endl is used to insert a newline character after printing the number.

• return 0;: Indicates successful execution and termination of the main() function.