Print a long duble

[d31mOZ]

How i can print a variable "long double", for example:

Code: Select all

#include <iostream.h>

int main()
{
        long double n1 = 100000000;
        cout << n1;
        return 0;
}        

The program is good, but print:
1e+08

I want that print:
100000000

What i can do it?

Greetings...

[andresw1]

Hello,

You can use the stdio.h instead of iostream. With stdio.h you can print long double in the following way:

long double d = 100.0;

printf("%Lf",d); -> This wil print something like 100.00000000
To cut the 0's in the end you can modify the %lf in the following way
printf("%.3Lf",d); -> The number after the dot is how many digits you want to print after the hole part.

If someone knows hoe to do it with iostram I would also be intrested to understand... Now when I have doubles in the problem I use stdio, otherwise iostream...

[Edit] "Lf" instead of "lf" after misof noticed my mistake. I'm sorry.

[misof]

The correct format string for a "long double" is "%Lf", not "%lf". The format string "%lf" is for "double".

About doing it using streams, you really should consider using Google. E.g., try the query "cout fixed format".

[Krzysztof Duleba]

It's easy when you know that "fixed" is the keyword. However, even simple search at C++ board for iostream double returns the answer.