Check out example codes for "how to print 5 precision float in c++". It will help you in understanding the concepts better.

Code Example 1

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

int main() 
{
    // This code helps you to print a number with desired decimal
    double Number=10.3454;
    printf("%.3lf",Number);

    return 0;
}

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