Check out example codes for "how to print a decimal number upto 6 places of decimal in c++". It will help you in understanding the concepts better.

Code Example 1

#include <iostream>
#include <iomanip>

int main()
    double d = 122.345;

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

Code Example 2

#include <iostream>
#include <cstdio>
using namespace std;

int main() 
    // This code helps you to print a number with desired decimal
    double Number=10.3454;

    return 0;

Code Example 3

std::cout << std::setprecision(2) << std::fixed;
// where the 2 is how many decimal places you want
// note you need to <iomanip>

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