Precision in double value mfc

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how to fix my double value to 14 digits after decimal point. in order to cmpare with VB i want to fix my double value to 14 digits ..iam doing in mfc.. how to do in mfc.

in VB the double value precision is always 14. but in our mfc its 16. so i want to fix the value to 14.

What I have tried:

double d = 2.483650149760682

i want these value as 2.483650149760

Posted 31-May-17 23:50pm

Member 12677926

Updated 1-Jun-17 1:32am

OriginalGriff

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Jochen Arndt · Answer 1 · 2017-06-01T01:31:00

Just print them with the required number of digits after the decimal point:

C++

double d = 2.483650149760682;
// Prints as 2.483650149760 (12 digits after decimal point)
printf("%.12f\n", d);

See printf - C++ Reference[^] for the format options. To print to a buffer (prepare string) use sprintf - C++ Reference[^] or a formatting method of the used string class (if available, e.g. CStringT::Format[^] ).

When using C++ streams use the setprecision - C++ Reference[^] method.

Richard MacCutchan · Answer 2 · 2017-06-01T01:32:00

You already posted this question at Vb string to double vs mfc cstring to double[^]; please do not repost. I also explained what the issue is and gave you a link to an article that explains floating point numbers. As I said then, if you really do not understand floating point you should avoid using them.

Precision in double value mfc

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