CODEWITHSUNDEEP
c++floating-pointformatting
Michel Keijzers
Michel Keijzers

Reputation: 15357

setprecision does not show digits

I have the following function fragments:

bool A_AbstractTester_Actor::Equals( int lineNumber, T_String valueText, double value, T_String expectedText, double expected, double accuracy )
{
    ...
    v_FailedText << std::setprecision(8) << "\nLine " << lineNumber  
     << ": EQUALS_DOUBLE FAILED, Value '" << valueText << "' (" << value 
     << "), Expected '" << expectedText << "' (" << expected << ")\n";

Later I print v_FailedText and the result is:

Line 242: EQUALS_DOUBLE_FAILED, Value 'step' (0), Expected '1.0' (1)

What I expected was :

Line 242: EQUALS_DOUBLE_FAILED, Value 'step' (0.00000000), Expected '1.0' (1.00000000)

Upvotes: 1

Views: 48

Answers (1)

ForEveR
ForEveR

Reputation: 55887

You should use std::fixed manipulator.

bool A_AbstractTester_Actor::Equals( int lineNumber, T_String valueText, double value, T_String expectedText, double expected, double accuracy )
{
    ...
    v_FailedText << std::fixed << std::setprecision(8) "\nLine " << lineNumber  
     << ": EQUALS_DOUBLE FAILED, Value '" << valueText << "' (" << value 
     << "), Expected '" << expectedText << "' (" << expected << ")\n";

Upvotes: 2

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