Home/ Questions/Fix the error: ''nullptr was not declared in this scope c++''?
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pete
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Asked: 2022-07-20T03:56:58+00:00 In:

Fix the error: ”nullptr was not declared in this scope c++”?

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Today, when I am running my program, I encounter the ”nullptr was not declared in this scope c++” error.

I have g++-4.6 installed and I am using Eclipse Helios. I hope to be correct in saying that g++4.6 incorporates C++ 11 features. I’ve developed a C++ project that makes use of the auto and nullptr keywords. The following errors are produced by the build:

../{filename}.cpp:13:13: error: ‘nullptr’ was not declared in this scope

../{filename}.cpp:14:2: warning: ‘auto’ will change meaning in C++0x; please remove it [-Wc++0x-compat]

Please assist me in resolving this issue.

Many thanks!

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1 Answer

  1. Best Answer
    Expert

    Solution: You can fix this error by these below steps:

    1. Add the -std=c++0x compiler argument under Project Properties
    2.  C/C++ Build
    3. Go to Settings -> GCC C++ Compiler
    4. Choose Miscellaneous
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