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C++ How to get fixed digit after decimal in output???? Like f=123.456789 I want to show 123.46 in output.

H M Mohidul Islam
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  • possible duplicate of [How do I print a double value with full precision using cout?](http://stackoverflow.com/questions/554063/how-do-i-print-a-double-value-with-full-precision-using-cout) – Alexandre Lavoie May 24 '15 at 06:03
  • So you took the `cout` path. You deserve a punishment for this and the punishment will take the form of C++ formatting. You'll suffer this pain for the rest of your C++ programming life. – 6502 May 24 '15 at 06:09

4 Answers4

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You can use the setprecision() method in C++.

cout<<std::fixed<<std::setprecision(2)<<f;
Adithya Upadhya
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  • I'd downvote the answer given how ugly and wrong this code is on so many levels. I won't just because it is, unfortunately, what C++ texts recommend to do. But I really cannot upvote it, that's too much. – 6502 May 24 '15 at 06:03
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Another way is to use printf function, make sure that you include stdio.h file to use it,
printf("%0.2f",f);
Here %f is format specifier(float) and 0.2 between '%' and 'f' is used to set precision upto two decimal places.

Angad Singh
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you could also use boost::format 

#include <boost/format.hpp>

cout << boost::format("%.2f") % f << endl;
sp2danny
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You'd require I/O manipulator for decimal precision.

#include <iomanip>
#include <iostream>

int main( )
{
    double foo = 123.456789L;

    std::cout << std::setprecision(2) << std::fixed << foo << std::endl;

    return 0;
}
Achilles Rasquinha
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