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Alex Rivera
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I want to print a double value to std::cout portably (GCC, clang, MSVC++) such that the output is the same on all platforms. I have a problem with the formatting of the exponent. The following program #include <iostream> int main() { std::cout << 0.1e-7 << std::endl; return 0; } Has this output with GCC: 1e-08 and the following output with MSVC 1e-008 How can I make both outputs the same? I'm sorry if this is a dumb question but I have not found an answer so far. All formatting seems to evolve around the formatting of everything before the mantissa... EDIT: The output of GCC is 1e-08 not 1e-8 (as originally stated) so it is conforming. Sorry for the confusion. EDIT2: Actually renamed "mantissa" to "exponent" following Dietmar's remark. There also is a section on Wikipedia on mantissa vs. significant .
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